dummy‑load‑sch.pdf 

ZHIYU ZPB30A1 60W dummy load
input voltage: 12V 0.5A (11‑14V)
 constant current: 0.20‑9.99 A
• review https://youtu.be/snROh2acybs 
• Reverse Engineering https://youtu.be/KYncNH8_m70 
• 60W Dummy Load Mod 20mA to 999mA https://youtu.be/K‑7kgfbH‑eI 
modes
hold run button at power on
Fun1 ‑ dc load (continue working on voltage alarm)
 Fun2 ‑ battery test (stop load at specified voltage)8n
serial
115200 8n1
pins from bottom of the board upwards
G ‑ GND
 R ‑ RX
 T ‑ TX
 L ‑ always low?
 F ‑ 50 Khz quare wave
 Vc ‑ input voltage
3 byte output, first two bytes are BCD voltage (3.35V) and last one is status (1=ok, 0=under voltage alarm)
pi@rpi2 ~ $ microcom -s 115200 -p /dev/ttyUSB4 | od -An -t x1 -w3
 04 35 01
*
 04 36 01
 04 35 01
*
 04 36 01
*
 04 35 01
*
 04 36 01
 04 35 01

replacement firmware
• https://github.com/ArduinoHannover/ZPB30A1_Firmware