Category Archives: General Electronics

Connections…

If any of you are wondering about the connectors used on the printed circuit boards (PCBs), these are known as Dupont connectors –

Dupont Connector

You can buy them in different sizes from single way (shown above) to  ten way and above. If you search on your favourite auction site you will find many suppliers selling the connector housing, connectors and the crimp tools also. You can also crimp the connectors with a pair of pliers if you are careful.

There is a detailed article on this blog with lots more information.

Adafruit…?

Well, after playing around with the servo code the jitter is still there. It would appear that the Wire library used to interface with the i2c bus really messes with the timing that in turn causes the servo jitter. I happened to have lying around one of the Adafruit Servo PWM boards, these provide a hardware PWM controller controlled via a i2c connection – ideal.

Initial results look good although the costs are higher than using just arduino variants. However, a quick Google on our favourite auction site finds similar modules for just over £2 each. In addition, since the original plan was to use 8 servos per arduino, these modules support 16 servos each.