Simple Solar Charger Circuit Diagram

This is a simple solar charger circuit can be constructed using this circuit diagram .The nominal voltage of the solar charger circuit module is determined by the number of battery cells to be charged. Because of the typical voltage drop of 0.3 to 0.4 V across Schottky diode D1, the nominal voltage should exceed the charge voltage set on P1 by about 0.3–0.4 V.

Simple Solar Charger Circuit Diagram  

Simple Solar Charger Circuit Diagram


The solar panel for this project is a typical solar module that consists of eight series connected solar cells. In sunshine the solar panel will supply about 140 mA -200mA or more( depends of the solar panel used ) at 8 times 0.45 V = 3.6 V.

If you don’t find a zenner diode with this value you can use two normal diodes connected in forward bias ( cathode connected to the ground ) .

Using the P1 potentiometer you can set the final charging voltage at the desired voltage .The voltage across the batteries is continuously monitored by the circuit around T2.

When the voltage rises above a certain level (full charge ), a power resistor is switched in parallel with the solar panel, which causes output voltage of the solar panel to drop and stops the batteries from being charged .

The Ultimate Value for Money Mid-ranger POCO X2 Review

There were some serious doubts about the future of the POCO brand after some of its top executives left the budding new venture in 2019. However, in 2020, Xiaomi’s brainchild has been reborn and it has brought something quite unexpected to the market – the POCO X2. Yes, for months, fans of the iconic POCO F1 had been clamouring to see a true successor (and we’ll likely still see it) but the POCO X2 was something very unpredictable. The handset starts at Rs 15,999 or $225.

The Ultimate Value for Money Mid-ranger POCO X2 Review


We’ve had a review unit (Phoenix Red, 8GB + 256GB) of the handset and we’ve put it through its paces to see if it is the best all-round mid-range smartphone around, as it is thought to be by many. After all, the brand’s philosophy is “Everything you need, nothing you don’t.” For a short spec-sheet tour, we’ll leave you with a list below.

POCO X2 – MAIN SPECIFICATIONS

  •     6.67-inch (1080 × 2400 pixels) Full HD+ 20:9 LCD screen with 120Hz refresh rate, HDR 10, Corning Gorilla Glass 5 protection
  •     Octa Core (2.2GHz Dual + 1.8GHz Hexa) Snapdragon 730G 8nm Mobile Platform with Adreno 618 GPU
  •     6GB LPDDR4X RAM with 64GB / 128GB (UFS 2.1) storage, 8GB LPDDR4X RAM with 256GB (UFS 2.1) storage, expandable memory up to 512GB
  •     Hybrid Dual SIM (nano + nano / microSD)
  •     64MP rear camera with LED Flash, Sony IMX686 sensor, 0.8μm, f/1.89 aperture, 8MP 120° ultra-wide sensor with 1.12μm, f/2.2 aperture, 2MP depth and 2MP macro sensor with 1.75μm, f/2.4 aperture, 4K 30fps, 960 fps at 720p
  •     20MP front-facing camera with f/2.2 aperture, 2MP secondary camera with 1.75μm pixel size for portrait
  •     3.5mm audio jack, FM Radio, 1217 Linear Speaker, Qualcomm Aqstic WCD937x audio codec
  •     Side-mounted fingerprint sensor, IR sensor
  •     Android 10 with MIUI 11
  •     Splash resistant (P2i coating)
  •     Dimensions: 165.3×76.6×8.79mm; Weight: 208g
  •     Dual 4G VoLTE, WiFi 802.11 ac (2.4GHz + 5GHz), VoWiFi, Bluetooth 5, GPS/GLONASS/Beidou, USB Type-C
  •     4500mAh (Typical) / 4400mAh (Minimum) battery with 27W fast charging

Design and Build

The POCO X2 doesn’t do anything spectacular in terms of design. You’ve got a polycarbonate build, a gradient back, and a circular shimmering patch surrounding the rear camera similar to the Huawei Mate 30. It’s bigger than the Redmi K20 Pro (which means one-handed use is usually not possible) but has slightly curved corners to give an ergonomic in-hand feel. It’s also glossy and quite the smudge magnet and slippery as hell. You do get a TPU back case in the box though. Also, the rear camera module is raised quite a bit and it will make the handset wobble. It’s also the first POCO handset with a side-mounted fingerprint reader and we’ll be seeing a lot of it this year.

Display

As you’ve already seen, the POCO X2 has a big screen, and even after being an LCD, it gets very bright outdoors, even more than the AMOLED Redmi K20 Pro display. Suffice to say, the viewing angles are great and the colour accuracy is also very good. Also, this time, there’s support for Widevine L1 out-of-the-box. This thus allowes you to view HD content on Netflix, Prime Video and more.

But there’s one more thing, a 120Hz refersh rate!  Yes, it’s the first handset at this price range to feature such a smooth-scrolling panel. And jumping from a 60Hz refresh rate, the difference is very much noticeable in regular use. However, apart from a handful of games, there’s not much use of those smooth frames sadly. Developers have still not caught up with hardware makers and hence we’re left with unfulfilled potential in the end. Thankfully, POCO lets you choose between refresh rates which is… refreshing.

Dual Hole-Punch and Side-Mounted fingerprint reader

Believe me or not, the side-mounted fingerprint reader has been the most annoying addition to the POCO X2, in my usage. Coming from a Redmi K20 Pro, I’ve consistently felt it very difficult to unlock the phone when it’s lying flat on the table (which is 70% of my use case scenario), not to mention when it is in my left hand. The back being very slippery doesn’t help either and neither does face unlock. I wish it could have a front fingerprint reader.

The POCO X2 has dual front cameras and that makes the notch wider and more noticeable. I also noticed some backlight bleeding surrounding the punch-hole but it’s nothing you can’t ignore. It can come in the way of content at times but it’s not a deal-breaker in my opinion and you get used to it. It can be rendered invisible as well from the settings. I’d prefer a pop-up camera over this one but ‘we’re now past that phase in 2020. To sum it up, I’m more than satisfied with the display experience on the phone.

This is another area where Xiaomi and its sister brands usually nail it, especially when it comes to their mid-rangers and high-end phones. The POCO X2 comes with a Snapdragon 730G at just $225. Can it get any better than that? Only time will tell. But this is an outstanding new chipset that is very reliable even for very demanding tasks such as graphics-intensive games like PUBG, CoD Mobile and Need for Speed.

There are almost no stutters or frame drops usually and gaming is a delight on the phone. I didn’t find the phone heating up either, however, my gaming sessions weren’t 1 hour long and gruesome. Needless to say, the POCO X2 just sails through all mundane tasks easily. If you’re looking for benchmarks, we’ve pasted some scores above.
Sound & Audio

Audio is where we don’t expect much of an improvement in mid-rangers and brands mostly don’t get punished for it either as long as they deliver the standard experience. The POCO X2 gives satisfactory sound output via the bottom grill, nothing too sub-par, nothing too extraordinary, in terms of volume and quality. The 3.5mm jack is pretty good though. For calls, I found the output speaker a bit lacking as voices on the other side were a bit hard to hear. I tried it a few times adjusting settings and even moving it to different positions to no avail.

Battery

The POCO X2 has a massive 4,500mAh juice pack and it easily lasts you a day. Well, at least on the 60Hz refresh mode, that is. The 120Hz, as much as I would like to keep it all day, does suck much more power and with my heavy usage doesn’t last me a complete day. I’d have to charge somewhere near the evening on a typical day to get through, and I’m quite a heavy user after evening. Most of my typical workday includes searching for stories, social media, and emails. After 5:00 pm, I switch to games and videos. There’s  27W fast charging as well. I mostly use my phone for social media and surfing the web for news stories when I’m working. And, when I’m not, streaming platforms take up a good chunk of time, apart from games like CoD Mobile.

Software

POCO doesn’t use much of a different skin on top of Android. It employs MIUI, but with a hint of nice customization called POCO Launcher. Also, it cuts down on the ad system and leads to an even better software experience than MIUI. If you’ve used a Redmi K20 Pro/Mi 9T Pro, it’s pretty much what you’ll be getting on the POCO X2.

Camera

The main camera (Sony IMX686) on the back of the POCO X2 is phenomenal at its price point. It captures very good details, has very good dynamic range and exposure levels are mostly well done in daylight scenarios. There are some instances where highlights are blown out a bit or even the shadows are a bit crushed. Otherwise, I’d say this is definitely one of my top three picks on a sub-Rs 16,000 phone. Selfies are a similar story except that it isn’t as sharp as the output of the rear sensor, however, that is to be expected. Still, as far as mid-range selfie cameras go, it’s a great shooter.

The story of ultra-wide is mostly the same on most phones except for one or two exceptions in the high-end segment. So,  you shouldn’t expect much from it, but the sensor is there if you need a new wide-angle perspective. Video capture is also great going up to 4K 60fps with decent stabilization and detail capture. There’s also a new very interesting Vlog mode.  This feature helps you to capture creative intro montages for your vlog videos in real-time with no need of any editing tool. You only have to select from one of the presets and start shooting the clips.  All in all, this is one of the best or even the best camera under Rs 16,000 in India. And with Gcam mods, I’d say it will only get better.

POCO has nailed the basic pillars of a successful smartphone with the POCO X2. This handset ticks many boxes that the Indian consumer wants on their phone including a good display, a reliable camera, and awesome performance at very reasonable prices. It’s verly likely my first pick under the Rs 16,000 segment in India.

How Drone Based LIDAR is Changing the Game in Various Industries

The term LiDAR stands for an acronym for Light Detection And Ranging, and most of the time Light Imaging, Detection, And Ranging, however, it had been originally a combination of the words light along with radar.

LiDAR is really a property surveying system that measures the exact distance to your target by illuminating that aim together with pulsed laser light and measuring the reflected rhythms with a sensor. The differences in the period of time is that it requires the laser to reunite, and in the wave lengths, are subsequently utilized to create digital 3D-representations of their mark.

How Drone Based LIDAR is Changing the Game in Various Industries


Sonar works in a very similar manner, together with sound waves bouncing off an object and returning into their own origin indicating the distance to various points on the object, and hence enabling a 3D visualization of it.

Aerial data collection utilizing LiDAR with drones rather than airplanes is just a comparatively new land surveying procedure, that will be situated on high precision laser scanners, the Global Positioning System (GPS), and Inertial Navigation Systems (INS). These 3 things combine and enables exceptionally precise 3D mapping.

Among the revolutionary facets of LiDAR as compared to photogrammetry, that involves transferring the data out of a huge collection of photographs is that it lets surveyors cut foliage and also other intervening debris to generate an in-depth topographical map of a landscape with the help of ArcGis Training,

How is LIDAR Getting Employed Today With Drones?


Earlier drones, LiDAR could only be employed for aerial statistics collection with airplanes, which assumed that it'd become expensive and perhaps not widely accessible. However, since drone technologies develop increasingly more economical, LiDAR technology is maintaining pace, which suggests the accurate surveying has become more easily available for everyone, rather than simply significant, well-funded projects. Even though LiDAR continues to be costlier than photogrammetry (we'll cover the differences between both of these approaches to data collection for surveying in detail below), it is currently a lot more accessible as it was some time ago.

After surveying, LiDAR is usually Required in situations where:

●    You're mapping below tree blossom, mine site conveyors, along with other obstacles.
●    You're simulating narrow objects that call for greater accuracy of detail, such as transmission lines, pipes, and sharp-edge features (such as roof borders ), and fields of rocks (aggregates).

Here are some situations where LiDAR Is being used now

Archaeology


Perhaps one of the most notable (and just plain cool) uses of LiDAR is in helping archaeologists in finding new sites that are ruin, as well as enabling them to better comprehend existing sites. LiDAR and learn ArcGis may let them find a perspective into what's there without needing to dig in any respect.

Earlier this year the Smithsonian reported using LiDAR to investigate 430 kilometers of the jungle at the El Mirador Basin, a huge area in Central America rife with all of the Mayan cultures which features enormous streets and networks of temples, and this had been discovered by applying LiDAR data.

Without LiDAR, El Mirador might have never been found, or not in its own full totality--that will be significant since the discovery of these ruins at El Mirador signifies a high degree of technical and cultural elegance at an infinitely more ancient time than current archeological notions had speculated to get the Mayans, and afterward has caused a broad rethinking of our comprehension of the whole Mayan environment.

Industrial & Agriculture Surveying and Mapping



LiDAR is used in numerous industrial programs to make 3D maps for:
●    Stockpile measurements
●    Mining operations, including the measurements of ore volumes for mining
●    Topographical mapping for big industrial projects and construction projects
●    Tracking tools
●    Measuring roadways beneath traffic (i.e., while cars are driving on them)

It is critical to be aware that, when it comes to industrial uses, LiDAR is commonly utilized along with photogrammetry scroll down to get a comprehensive contrast of the two.

Agriculture


LiDAR assists farmers to develop across new areas where costly compost is going to be overused, as well as helps to create elevation channels of farmland which might be transformed into slope and sunlight conservation field maps. Extension information provided by means of LiDAR could be used to produce substantial, medium, and low yield manufacturing distance maps, and also pulled information may enable farmers to conserve fertilizer and additionally optimize their own efforts.

Conservation


LiDAR can help to create accurate maps for conservation efforts, and a lot of U.S. states have undertaken intensive information collection initiatives to record their own natural resources in order that they can better safeguard them. The Iowa Department of Natural Resources, even by means of example, makes use of LiDAR statistics to find their own Geographic Information System (GIS), also a repository of information regarding every one of the organic resources from their nation.


Forestry continues to be a single field of conservation in which LiDAR has been employed to measure canopy heights, biomass measurements, and foliage locations.

Water conservation is simply another location where LiDAR information can be utilized to map culverts, flood plains, watersheds, along with regions of both inundation and depression (i.e., wherever flood and drought could occur in the future).

Dune monitoring along with other associated observation of organic resources could possibly be achieved by means of LiDAR, together with some federal parks which are started to allow investigations into employing drones to map and simulate the motions of dunes.

Self-Driving Cars

One of the ways in which LiDAR technology is currently being utilized which do not always have a thing to accomplish with drones or surveying, however, it's genuinely trendy that we presumed it might be well worth viewing, in the development of self-driving vehicles. LiDAR could detect yellowish lines onto the road, which informs the vehicle by which to drive, and Adaptive Cruise Control (ACC) makes use of LIDAR technology, assisting vehicles at railroad control to slow down when there's a vehicle ahead and also accelerate it if there isn't any traffic.

PHOTOGRAMMETRY VS LIDAR

When it comes to surveying, there's been a continuing debate about the relative values of photogrammetry and LiDAR, and which will be best.

The reality is that there isn't a single right answer it is really a matter of the particular application being contemplated. Photogrammetry is ideal for several instances, while LiDAR is ideal for many others.

Photogrammetry is the science of making measurements from photographs for documenting the specific rankings of surface things in order to generate a 3D map.

Photogrammetry has historically been a comprehensive, time consuming procedure, however, drones have radically changed matters, either by enabling thousands of aerial images to be obtained of a single site in one flight and because of new technology has been developed to help integrate most of those photos to a single 3D map.

So how one can decide whether to use LiDAR or photogrammetry?

Generally, the rule of thumb is that photogrammetry is excellent for surveying big sites which are not blocked by tree cover or other impediments, where LiDAR is an excellent option for surveying smaller, obstructed sites. (It is worth noting that these size recommendations are mainly about the cost since LiDAR gets more economical, the price might be less of a contributing element in choosing one or the different technology for analyzing demands.)


LiDAR should be utilized when

●    You're mapping tree canopy, mine site conveyors, along with other obstacles because photogrammetry has trouble generating elevation models in places where things obstruct the ground.
●    You're simulating narrow objects like transmission lines, pipes, sharp-edge features (such as roof edges), and fields of rocks aggregates because alternative mapping techniques like SfM algorithms and DIM have diminished"conformance" compared to LiDAR, and so results in a lower quality of detail in the 3D map produced.

Photogrammetry Needs to Be Properly Used when:

●    You're imaging bare ground mine sites, earthworks assignments together with other areas that are not occluded from buildings, trees, and alternative products.
●    You're performing just a little mapping project together with photogrammetry information that'll satisfy the needs you have.

Despite all this, the general advice is that when you are using LiDAR, then you should also utilize photogrammetry. The explanation is that LiDAR could be more costly of these two options, and also since photogrammetry will offer additional useful data.

However, new LiDAR technology can reverse some of the information on its own. After all, the more economical and available LiDAR to acquire drones gets the more people to come across adoption.



Author’s Bio
Name -  Aakriti Mohak
Location - Jaipur, Rajasthan, India
Designation - SEO Executive



Aakriti Mohak serves as an SEO Executive in a leading wordpress development company and there he handles all works related to SEO and Content Writing. In her free time she enjoys reading books

Motorbike Alarm

This simple to build alarm can be fitted in bikes to protect them from being stolen. The tiny circuit can be hidden anywhere, without any complicated wiring. Virtually, it suits all bikes as long as they have a battery. It doesn't drain out the battery though as the standby current is zero. The hidden switch S1 can be a small push-to-on switch, or a reed switch with magnet, or any other similar simple arrangement. The circuit is designed around a couple of low-voltage MOSFETs configured as monostable timers. Motorbike key S2 is an ignition switch, while switch S3 is a tilt switch. Motorbike key S2 provides power supply to the gate of MOSFET T2, when turned on. 
When you turn ignition off using key S2, you have approximately 15 seconds to get off the bike; this function is performed by resistor R6 to discharge capacitor C3. Thereafter, if anyone attempts to get on the bike or move it, the alarm sounds for approximately15 seconds and also disconnects the ignition circuit. During parking, hidden switch S1 is normally open and does not allow triggering of mosfet T1. But when someone starts the motorbike through ignition switch S2, MOSFET T2 triggers through diode D1 and resistor R5. Relay RL1 (12V, 2C/O) energises to activate the alarm (built around IC1) as well as to disconnect the ignition coil from the circuit. Disconnection of the ignition coil prevents generation of spark from the spark plug. Usually, there is a wire running from the alternator to the ignition coil, which has to be routed through one of the N/C1 contacts of relay RL1 as shown in Fig.1 Fig.2 shows the pin configurations of SCR BT169, MOSFET BS170 and transistor BC548.
Circuit diagram :

Motorbike Alarm

 Motorbike Alarm Circuit Diagram

Motorbike Alarm-Pin Configurations :


Pin configurations of BT169, BS170 and BC548
 
Also, on disconnection of the coil, sound generator IC UM3561 (IC1) gets power supply through N/O2 contact of relay RL1. This drives the darlington pair built around T3 and T4 to produce the siren sound through loudspeaker LS1.  To start the vehicle, both hidden switch S1 and ignition key S2 should be switched on. Otherwise, the alarm will start sounding. Switching on S1 triggers SCR1, which, in turn, triggers MOSFET T1. MOSFET T1 is configured to disable MOSFET T2 from functioning. As a result, MOSFET T2 does not trigger and relay RL1 remains de-energised, alarm deactivated and ignition coil connected to the circuit.  Connection to the ignition coil helps in generation of spark from the spark plug. Keeping hidden switch S1 accessible only to the owner prevents the bike from pillaging. Tilt switch S3 prevents attempt to move the vehicle without starting it. Glass-and metal-bodied versions of the switch offer bounce-free switching and quick break action even when tilted slowly. 
Unless otherwise stated, the angle by which the switch must be tilted to ensure the contact operation (operating angle), must be approximately 1.5 to 2 times the stated differential angle. The differential angle is the measure of the 'just closed' position to the 'just open' position. The tilt switch has characteristics like contacts make and break with vibration, return to the open state at rest, non-position sensitivity, inert gas and hermetic sealing for protection of contacts and tin-plated steel housing. If you find difficulty in getting the tilt switch, you may replace it with a reed switch (N/O) and a piece of magnet. The magnet and the reed switch should be mounted such that the contacts of the switch close when the bike stand is lifted up from rest.

Cheap Bicycle Alarm Schematics Circuit

The author wanted a very cheap and simple alarm for some of his possessions, such as his electrically assisted bicycle. This alarm is based on a cheap window alarm, which has a time-switch added to it with a 1-minute time-out. The output  pulse of the 555 replaces the reed switch in the window alarm. The 555 is triggered by a sensor mounted near the front  wheel, in combination with a magnet that is mounted on the spokes. This sensor and the magnet were taken from a cheap bicycle computer. 

Circuit diagram :

Cheap Bicycle Alarm Schematics Circuit

Cheap Bicycle Alarm Circuit Diagram

The front wheel of the bicycle is kept unlocked, so that the reed  switch closes momentarily when the wheel turns. This  triggers the 555, which in turn activates the window alarm. The circuit around the 555 takes very little current and can  be powered by the batteries in the window alarm.  There  is just enough room  left inside the enclosure of the window  alarm to mount the time-switch inside it. 

The result is a very cheap, compact device, with only a single cable going to the reed switch on the front wheel. And the noise this thing produces is just unbelievable! After about one minute the noise stops and the alarm goes back into standby mode. The bicycle alarm should be mounted in an inconspicuous place, such as underneath the saddle, inside a (large) front light, in the battery compartment, etc.
Hopefully the alarm scares any potential thief away, or at least it makes other members of the public aware that something isn't quite right. 

Caution. The installation and use of this circuit may be subject to legal restrictions in your country, state or area.

Little Door Guard

If some intruder tries to open the door of your house, this circuit sounds an alarm to alert you against the attempted intrusion. The circuit (Fig. 1) uses readily available, low-cost components. For compactness, an alkaline 12V battery is used for powering the unit. Input DC supply is further regulated to a steady DC voltage of 5V by 3-pin regulator IC 7805 (IC2).

Little Door Guard


Fig. 1: Circuit of the door guard

Assemble the unit on a general-purpose PCB as shown in Fig. 4 and mount the same on the door as shown in Fig. 3. Now mount a piece of mirror on the door frame such that it is exactly aligned with the unit. Pin configurations of IC UM3561 and transistors 2N5777 and BC547 are shown in Fig. 2.



Fig. 2: Pin configurations of UM3561 and transistors 2N5777 and BC547

Initially, when the door is closed, the infrared (IR) beam transmitted by IR LED1 is reflected (by the mirror) back to phototransistor 2N5777 (T1). The IR beam falling on phototransistor T1 reverse biases npn transistor T2 and IC1 does not get positive supply at its pin 5. As a result, no tone is produced at its output pin 3 and the loudspeaker remains silent. Resistor R1 limits the operating current for the IR LED.

When the door isopened, the absence of IR rays at phototransistor T1 forward biases npn transistor T2, which provides supply to  positiveIC1. Now 3-sirensound generator IC UM3561 (IC1) gets power via resistor R5. The output of IC1 at pin 3 is amplified by Darlington-pair transistors T3 and T4 to produce the alert tone via the loudspeaker.


Fig. 3: Back view of the door assembly

Rotary switch S2 is used to select the three preprogrammed tones of IC1. IC1 produces fire engine, police and ambulance siren sounds when its pin 6 is connected to point F, P or A, respectively.





Author : T.K. Hareendran

Simple Car Battery Voltage Monitor Circuit

This circuit is used to monitor the battery voltage to display a dual-colored LED status of the battery to. If the LED “green”battery voltage exceeds 11.9 volts. If the yellow LED, battery voltage 11.9 to 11.5 volts. If the LED is “red” If the battery voltage below 11.5 volts. You can of course change the trigger points by the trimmer resistors and / or changing the value of the resistors in the divider.

Simple Car Battery Voltage Monitor Circuit


A dual op amp is used as a comparator. The green LED on the board, until the voltage exceeds 11.5 volts. The red LED illuminates when the voltage falls below 11.9 volts to the circuit. Therefore, in the 11.9 to 11.5 volts, both LEDs are on, producing a slightly yellow color. When the voltage falls below 11.5 V, the green LED, and now only the red LED flashes to indicate low voltage.

Electronic Parts List
R1=1K2
R2-3-4=680R
R5=15K
R6=10K
R7-8-9-10=1K
IC1=LM324
D1=5V6 /0.5W Zener
D2-3-4-5=LED
RV1=10K trimmer

Is recommended that multi-shaper for V1 and V2. Muti-trimmer makes it much easier to trigger points to make as a less expensive single-turn trimmer. The trimmer can be completely eliminated if you have access to a range of 1% resistors and has had calculated carefully. You would also want to provide more accurate reference voltage as the common 78L05 regulator.

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