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Battery level monitor

Battery level monitor

Created by oliverhanka on 2020-06-04 11:51:50

2 Layer Board - 1.2785 sq in (1.3581in x 0.9414in) / 824.84 sq/mm (34.5mm x 23.91mm)
$5.11 per set of 4 ($4.00 per sq in)

Battery level monitor

The board is designed to measure the battery level (voltage) with an uC's ADC. The on-board voltage divider must be parameterized (R1 and R2) according to the uC's max ADC input as well as the battery's voltage level. The battery voltage may be higher then the ADC's Vcc.

The circuit includes two MOSFETs to cut-off the voltage divider in order to not drain the battery when not in use. The uC must pull up EN to activate the voltage divider. If EN is left floating (e.g., the uC is turned off or in deep-sleep), the on-board pulldown resistor cuts of the voltage divider.

License: CC-BY 4.0
Project URL: https://github.com/oliverhanka/battery_level_monitor
Tags: voltage divider, measurement, adc, low power, esp32, arduino, esp8266

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Mini-Lora (Grove version)

Mini-Lora (Grove version)

Created by hallard on 2017-06-29 20:12:39

2 Layer Board - 2.7408 sq in (2.7110in x 1.0110in) / 1768.25 sq/mm (68.86mm x 25.68mm)
$10.66 per set of 4 ($3.89 per sq in)

Small LoraWAN node working with LMIC and various battery size and grove connector

License: CC-NC-NA-4.0
Project URL: https://github.com/hallard/Mini-LoRa
Tags: lorawan, lmic, arduino, mini, rfm95, lora, low, power, grove, i2c

26 people have said "Thank You" for this board.

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Mini-Lora

Mini-Lora

Created by hallard on 2017-06-29 20:11:59

2 Layer Board - 2.7408 sq in (2.7110in x 1.0110in) / 1768.25 sq/mm (68.86mm x 25.68mm)
$10.66 per set of 4 ($3.89 per sq in)

Small LoraWAN node working with LMIC and various battery size

License: CC-NC-NA-4.0
Project URL: https://github.com/hallard/Mini-LoRa
Tags: lorawan, lmic, arduino, mini, rfm95, lora, low, power, i2c

21 people have said "Thank You" for this board.

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Top View - Complete Board

Top View - Complete Board

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Bottom View - Complete Board

Bottom View - Complete Board

This is what your finished board will look like from the bottom.