A few months ago I bought my first Picaxe - a 28x1 board. Reading the manuals, I noticed that many of the axes used the same pins for supply, earth, ser in and ser out. Great, I'll build a universal jobbie like my pic programmer !!
Thank goodness, not to be. First attempt was a stripboard design for a 28x and an 18x, bringing all the pins out to headers also sockets for the darlington array and a motor driver. While we're at it, might want to flash a couple of LEDs, so add them and a couple of buttons. Screwed to a piece of ply, along with a couple of breadboards.
It wasn't long before I decided that separate boards would be useful for the various Axes. I made plug in modules that fitted the breadboard power rails for the 18,20 and 28 pin chips, and modded a 8 pin board to fit.
So, as the original stripboard became redundant, a rebuild was required.
The new one has the array and motor driver as before with the addition of a resistor chip for servo's, a peizo, an LCD and serial driver chip, a 10K pot for ADC and an audio amp, 1/4 watt 8 pin deviceand an eeprom.
I didn't like the modded 08 board so I incorporated that as well.
The supply is a well regulated wall job giveing 12 volts. This gave me the chance to bring 12v to the board. Note the red links near the 2803 and L293 chips to switch from 5.0v to 12v. A 5.0v regulator feeds the rest.
Thank goodness, not to be. First attempt was a stripboard design for a 28x and an 18x, bringing all the pins out to headers also sockets for the darlington array and a motor driver. While we're at it, might want to flash a couple of LEDs, so add them and a couple of buttons. Screwed to a piece of ply, along with a couple of breadboards.
It wasn't long before I decided that separate boards would be useful for the various Axes. I made plug in modules that fitted the breadboard power rails for the 18,20 and 28 pin chips, and modded a 8 pin board to fit.
So, as the original stripboard became redundant, a rebuild was required.
The new one has the array and motor driver as before with the addition of a resistor chip for servo's, a peizo, an LCD and serial driver chip, a 10K pot for ADC and an audio amp, 1/4 watt 8 pin deviceand an eeprom.
I didn't like the modded 08 board so I incorporated that as well.
The supply is a well regulated wall job giveing 12 volts. This gave me the chance to bring 12v to the board. Note the red links near the 2803 and L293 chips to switch from 5.0v to 12v. A 5.0v regulator feeds the rest.
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