All Questions
31
questions
0
votes
2
answers
159
views
How to correctly power an ESP32-H2 board with a battery
I'd like to power my ESP32-H2-DevKitM-1 board with a 3.7 V, 2000 mAh Li-po battery.
For this I think I must use this pin: Battery-3V3
The above picture is from the Pin Layout section of the ...
3
votes
2
answers
305
views
Read battery voltage with ADS1110
I have an ADS1110 that should read a battery's voltage (2.8V - 4.2V).
I have built this schematic:
The problem is, I connected the battery's negative terminal to VIN- and the PCB is already assembled ...
- 107
2
votes
4
answers
1k
views
Candle light flashing LED (max. 5V) burnt by attaching LiPo battery (3.7V)
I've bought a couple of candle light flashing LEDs with integrated circuits from Octosupply (Datasheet: https://www.micros.com.pl/mediaserver/info-olc.5c5800m.pdf) for a project and attached one to a ...
0
votes
1
answer
106
views
Voltage divider for 14.8 V Li-po to power 7.4 V servos
I'm wondering if there's a more straightforward solution than using a step-down converter for my robot. The robot is mobile, so it needs to run on rechargeable batteries (Li-po).
I'm using a Jetson ...
- 135
2
votes
5
answers
4k
views
Battery life calculation - depending voltage levels
I wonder if calculation of battery life depends on its voltage level. Basic calculation of battery life is given below:
Battery Life = Battery Capacity in mAh / Load Current in mAh
However, in this ...
2
votes
2
answers
585
views
MCP73871 Low Charge Current
I am trying to make some GameBoys use rechargeable LiPo batteries. I wanted to utilize a circuit that would allow me to play and charge at the same time and so I settled on the MCP73871.
https://ww1....
2
votes
1
answer
84
views
Li-po 18650 cell TLC: protection board with lower charging end voltage
When I look at 18650 Li-po cells with built-in cell protection (either the small disk type fitted to the top of the cell, or the side-mounted ones with straps that that run to the battery top and ...
- 31
1
vote
0
answers
782
views
Resistor value to discharge the battery
I had a LiPo battery with specifications of 14.8 V, 2200 mAh, 23.6 Wh with 25 C rating.
Can any one tell me how to calculate the resistance value.
Current= 25C x 2.2 A= 55 A
Power P = VI = 14.8 V x 55 ...
3
votes
0
answers
147
views
Arduino Every Nano with 3.7V Li-Po - Reading voltage
I have Arduino Every Nano and 3.7V Li-Po battery (Akyga LP903759). I want to read the current voltage of a battery using analog pin. If I use a 50 kOhm and 200 kOhm resistor (in voltage divider) I'll ...
- 31
3
votes
1
answer
614
views
TP4056 battery output (charging voltage) is not constant
I tried to design a charging circuit based on the TP4056 Li-po charger chip. At a USB voltage of 5 V, the battery charging output (Pin 5 of the TP4056) is 4.3 V. This seems acceptable, but there seems ...
- 45
0
votes
4
answers
285
views
Resistance effects on LED when connected to battery
I have this doubt whether to go with theoretical method or practical.
Lets say I'm using a 3.7V battery 350mAh to light up a LED which has forward voltage of 3.3V (which means LED lights up if 3.5V is ...
0
votes
0
answers
75
views
Overvolting brushed motors by 0.2V
For RC models, I own several brushed motors which are intended to operate at 7,2V. According to my previous tests, they usually take 25 amps, 30 being the absolute maximum.
To divide by two the weight ...
- 101
4
votes
2
answers
2k
views
Measure LiPo Battery Cells with Voltage Divider?
First, I am new in this topic, so please excuse unnecessary questions.
I want to measure the (four) cells of my lipo battery. The connector of the battery has a plus pole and four minus poles. (Image)...
- 143
-1
votes
1
answer
77
views
Using a 7.4 V LiPo Battery for an Arduino Feather 32u4
I am working on an Arduino project at the moment, with the following board:
Adafruit Feather 32u4
And it says I need 3.7 V of LiPo to power it.
However I also have a valve that I want to open and ...
0
votes
2
answers
81
views
Using an LIS3DH at LiPo Voltages
The LIS3DH 3-axis accelerometer specifies that it's supply voltage should be between 1.71 V and 3.6 V. For most applications, this just means you are using either 1.8 V or 3.3 V as your main rail. ...
