This is also true for most of the rectangular LiPo cells sold elsewhere. For the cells sold here the LC709203_NOM3p7_Charge4p2 is the correct selection. It is extremely important to choose the correct nominal and maximum cell voltage for the cell or the SOC will not be correct.
#Lipo battery monitor driver#
In the driver I have defined a number of constants to select the cell capacity and the nominal and maximum charge voltage of the cells. The LC709203F contains two different cell profiles and models for cells of 100mAh, 200mAh, 500mAh, 1000mAh, 2000mAh and 3000mAh capacities. The driver published on the GitHub page will correctly initialize the SOC device. The LC709203F is connected to the I2C bus and appears at address 0x0B. The interrupt can wake the ESP32 from deep sleep. The interrupt output of the LC709203F is connected to IO19 of the ESP32 and is also available on the board connector. The cell monitor can cause an interrupt when the SOC reaches a value that can be adjusted in software or it can cause the interrupt based on the cell voltage.
The algorithm does not use Coulomb counting so there is no build up of errors over time. Over time the algorithm updates its parameters to more accurately reflect the SOC of the cell.
changes of battery, temperature changes, loading, aging of the cell and self-discharge. The LC709203F ‘s algorithm eliminates the use of a sense resistor and provides accurate State of Charge (SOC) information even under unstable conditions e.g. The LC709203F is permanently attached to the LiPo cell and can monitor the state of charge with very low drain on the cell. The board has a LC709203F fuel gauge integrated and a good driver is available on the GitHubpage. It contains all the circuitry to charge and monitor a LiPo cell.
This board is a superset of the ESP32_Bat board. ESP32 Development Board with Onboard LiPo State of Charge Monitor, LiPo Charger, CP2104 USB to Serial.
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