why won't my picaxe 18m2 project board work?

hi there.
So i connected a servo to output 4, joined the 0v lines, had the two power sources, downloaded the sample code etc. Nothing happened.
I tested the system using the LED test from the picaxe manual and that was fine.
I must have tried to work the servo off the project board twenty times, until I removed the 18m2, placed it on a solderless breadboard, plugged the servo into the board, joined it all together with jumpers and as soon as I connected power the servo started preforming the code I downloaded while the 18m2 was still in the project board.
So why won't it work connected to the project board? I've tried using another output and a resistor on the signal line.
 If anyone has experience of working servos off a picaxe project board I'd appreciate a step by step walkthrough. As usual its probably something simple. thanks.

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rickharris4 years ago
You need to connect the servo DIRECTLY to the 18m2 NOT via the darlington buffer - There is a DIL resistor pack to replace the Darlington.

This is the normal issue.


CCT connections - DIL pack supplies the 330 ohm resistor.

Although I am reluctant to turn away "customers"

The Picaxe Forum is a MUCH better place to ask these questions. More experts there.

jonnymelon (author)  rickharris4 years ago
problem solved. I removed the darlington altogether and put a 330 resistor across the pins leading to the output I was using and away it went so thanks for your help. Next I need to find out how to slow it down, does that involve pwm values etc. I'm figureing this out as I go, I've no previous experience in electronics
You COULD connect it via the buffer, if you added a pullup on the buffer pin to the supply.
rickharris4 years ago
Well did you get it working.

We are paid by encouragement here you know!!!!
jonnymelon (author)  rickharris4 years ago
Hi rick. I haven't got around to testing your suggestion yet, but I asked the same question on the picaxe forum and it seems your suggestion is sound, I'll try it out as soon as I can. I need to find out how to get a 6 week old baby to sleep first, but I'll let you know if it works very soon. thanks