What is it?

Multi Servo Tester is a multiple servo testing tool, it has 4 I/Os which can be used as either PWM Input or PWM Output, 3 buttons to navigate the menu and a potentiometer to set the desired pulse width.

Why did you make it?

Working with many RC related hardware and servos, I needed a tool to read and write pulse width data, this tool fits my needs.

What makes it special?

I've built into it protection diodes and a micronucleus compatible USB port, its designed for prototyping so it also comes with 6 pin ISP port.

Can you solder it for me?

This project is a DIY type of project, unfortunately I don't have the time to solder this kit for you. But if you have a steady hand and decent SMT soldering skills, I only have a few tips.

• by far the hardest part is the USB socket, if you don't plan on using it, avoid it.
• Use plenty of flux, when you're done, use a toothbrush and some alcohol and the board will look like new.
• solder only 1 pin, position the part and when its set, solder the others.

Please note that the ATtiny84 included is not programmed, you'll have to use ISP 6 PIN to program it.

Can I program it myself?

Sure, the source code is available, if you find a way to get it smaller than 6k, you can flash micronucleus on it (via the ISP) and use it instead of ISP.

The project was built using PlatformIO, which became my favorite IDE for embedded since I've first tried it. There is a micronucleus and USBASP in the provided platformio.ini

Specs

• Maximum Input Voltage - 5v
• Maximum Total Current for servos - 3A
• PWM Output Range - 540-2400us
• PWM Input Range - 540-2400us