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A electronic dummy load with external pc control

• Scheme (pdf)
• Software

Serial control protocol

Here's documentation of the serial commands used to control the load

serial parameters :

• 9660 8N1
• end line : LF (\n)

Commands (upper or lower case) :

• D: display actual values (mA), dutyCycle, fan
• S xxxx: set current value (mA)
• +,-: push button
• T: display internal temperature
• F xxxx: set fan speed (0-255)
• H,?: show help

Answers :

command D :

S: NNN
R: NNN
D: 0xNNN
F: NNN

With :

• S : set current (mA)
• R : read current (mA)
• D : set duty cycle (0x0-0xFF)
• F : fan speed (0-255)

Command T :

T: NN.NN

With :

• T : atmega internal temperature (°C)

Links

• sources on github
• (detailled) blog post (in french)

Pictures

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final construction

Published on  June 1st, 2015