I would like to build a simple automatic irrigation system with Raspberry Pi zero, the thing is that I don't have access to electricity outside. I thought to connect 5v solar panel + 3\4 chargeable batteries.
Im not that familiar with building control circuits for charging batteries...
I need help building the electronics for a home project. Essentially I am trying to:
1. Charge a battery with a solar panel
2. Activate a 12solenoid valve controlling pressurized water with a push button
3. Have the solenoid close after an adjustable time delay
I was able to find solar...
I have a lamp which is powered by a 5V power supply and I want to upgrade it by powering it with a battery pack.
The issue is I want to use the lamp while charging its batteries but as I know charging and draining at one time is impossible so I searched for simple switching circuit but I...
I have lithium-ion battery pack that consists of 21 cells( 3 parallel,7 series,one of them 4,2V 3.4Ah).
I use this battery pack with BQ7791504PW from Texas Instruments for battery protection.This IC achieves pack protection via CHG and DSG low-side NMOS FET drivers.
I use this battery...
Hey, so I am trying to design and build my own battery charger for 4 cell LiPos (including HV-LiPos with 4.35v/cell) but I don't have a lot of experience with circuit design.
I designed this circuit so that it can either supply a constant voltage or constant current to the battery with the...
Which device best protects the rectifier and electronics inside an older style car battery charger? I have seen some manufacturers use an ATC blade fuse but I'm not sure if that will act fast enough to protect the circuits. I came across another device too, it's a Bussmann Circuit...
I have a wireless keyboard case for my iPad mini. When it’s off and I put it to charge the charge light turns on. But when I turn on the keyboard it’s dead. I’m looking at the circuit board and I think it has to do with the battery. The board looks fine. Can someone help me ?
I have a question about Li-ion rechargable batteries. I have almost no experience with it. Documentation to battery is very poor, but there is an info about charging profile: Stage 1: Constant Current 0.82 Ampere (0.2C) until Voltage reach 4.2V Stage 2: Constant Voltage (4.2V) with...
Hi, I am in the process of designing a battery to use with a pair of FPV goggles for drone racing, the goggles require a 2 cell battery, but I don't have a 2 cell battery charger. I do have a bunch of TP4056 charging boards, and I was looking to design an all in one unit that would hold 2...
I have a 10.8V Bosch battery which is standard for power tools. It has 5 terminals:
I'd like to power the device without the battery using a DC power supply. When I apply just the right voltage to + and - it doesn't work.
How am I supposed to mimick C1,C2 and T interfaces...
I would appreciate if someone would be able to comment/advice on the following matter. I have been looking around for an IC that would charge and balance Li-Ion cells 2-3 of them in series. It seems that the balance feature is absent in most cases. MCP73841 appears to provide most of the...
I am in the process of designing a MPPT controller for a wind turbine.
There are plenty of MPPT boards (with BQ24650 MPPT charge controller ICs) but these are fixed voltage MPPT designs tailored for photovoltaic applications.
So I decided to make a simple DC converter (buck boost design, non...
I'm just now getting into creating PCB's as a hobby, and created a little board that simply consists of a BLE module powered by a tiny Lithium polymer battery (40mah). Since the max operating voltage of the module is 3.6V, I also have an LDO that will drop the voltage down to 3.3V...