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Introduction

This page will show you step-by-step how to interface a DFRobot DFR0580 Solar Power Management to our Weather Center. LIVE DATA

Hardware Requirements

DFRobot DFR0580

This board utilizes a CN3767 Solar Power management IC. This IC requires an 15v~25v within 100W of Solar, it provides; 4A Trickle Charging, Constant Current, Constant Voltage, Float Charging dedicated to 12V Lead-Acid Batteries. It provides over-discharge protection for the battery at 10.8V (releases at 11.8V). In this design we are utilizing 4 INA219 Current sensors to monitor all Voltage rails around the DFRobot DFR0580 Solar Power Management board.

Back Plate Mounts


XBee 3 Power Monitoring

First make sure we are connected to XBee Network:

while xbee.atcmd("AI") != 0:
    print("#Trying to Connect...")
    time.sleep(0.5)

Next, Initialize INA219

solar_ina = INA219(SHUNT_OHMS, I2C(I2C_INTERFACE_NO), SOLAR_INA219A_ADDR)
solar_ina.configure_32v_2a()

Try Reading INA219:

solar_voltage = str(solar_ina.voltage())
solar_current = str(solar_ina.current())
print_solar = "Solar:" + time_snapshot + ":BusVolt:" + solar_voltage + "V:Current:" + solar_current + "mA:#"

Transmit values to xbee

xbee.transmit(TARGET_64BIT_ADDR, print_solar)


INA219 Example library:

This is our hacked INA219 library, it's was originally written and posted by: https://github.com/chrisb2/pyb_ina219, however it contained many micropython options not supported by the XBee 3.

https://github.com/eewiki/WeatherStation/blob/master/XBee_BatteryCharger/ina219.py

Output Data

Solar:153931972:BusVolt:0.236V:Current:-2.0mA:#
Battery:153931972:BusVolt:13.156V:Current:17.0mA:#
5V_Rail:153931972:BusVolt:5.236V:Current:23.0mA:#
12V_Rail:153931972:BusVolt:13.148V:Current:-2.0mA:



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