Let's Make Robots!


In working on my Mr BASIC kit, I needed a method to add a PICAXE 28X2 AXE020 board. This simplest way was to add longer spacers and "hang" the AXE020 under the pcb.

The AXE020 plugs into female headers solders to the underside of the pcb.

Based on an earlier post, I am concerned that the 3 AA batteries may not be adequate for the motors, as well as, having a very short life under load.

it seems that a separate 9 volt battery and regulator will also be needed for the AXE020, but there is plenty of room under the pcb for extra batteries..





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alright, its just that someone like me probably would not care about that kind of thing :)

It all depends on the end use and the overall physical size of the project.

I've made a bunch of "flashy thingies" that run happily off 2 AA's or a 3 volt coin cell.

For motors, because of the voltage loss through darlington drivers, 4.8 volts to 7.2 volts  is better.

What you should do is power your Picaxe with the 3xAA pack and the motors with a second power source, as displayed here:


All you have to do is take off the little jumper and connect your motor's seperate power source, but leave the battery snap connected to the 3x AA pack for your picaxe. 

That will work of course. the problem is that the ADC results are based on the supply voltage, As the 3 AA's drop in voltage, so will the ADC results. A regulated 5 voot supply is best.

At the same time you have to consider the sensors that you are using. Some sensors are not "happy" at 3.6 volts. LCDs require 5 volts. too.

It is a personal choice depending on the end use. 

Wooohoooo, the second Mr Basic that I see!