The PICAXE-20 standard interface board is a self assembly board fitted with a Darlington driver chip so that output devices such as motors and buzzers can be connected directly to the board. Supports 8 inputs (4 ADC) and 8 outputs. Requires a 20 pin PICAXE® chip.
Click here to download datasheet
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There are 8 inputs on the PICAXE chip so as long as your key pad is configured in a matrix then then there will be enough to go around. There is info on using a key pad in this ask-kitronik-using-a-pir-sensor-keypad-in-an-alarm video.
Hi Bradley, The voltage range which the PICAXE IC can handle is 4.5-5V. As such a voltage range between this suitable.
Yes you could use a Bi coloured LED, if it’s a 3 legged device this is very straight forward. If it’s a 2 legged device you would just need to sink the current through an NPN transistor to ground, with its gate connected to the LED output.
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