Comments on: Electronic Robot Car – L293D – 5v Motors – ATTiny – AVR http://howardsandford.com/blog/electronic-robot-car-l293d-5v-motors-attiny-avr/ ... somewhere on the interwebs for 'H' to have his say Mon, 21 Jun 2010 22:08:22 +0000 http://wordpress.org/?v=2.8.6 hourly 1 By: H http://howardsandford.com/blog/electronic-robot-car-l293d-5v-motors-attiny-avr/comment-page-1/#comment-5 H Sat, 26 Dec 2009 11:33:34 +0000 http://howardsandford.com/blog/?p=51#comment-5 Hi David, that's a good question. A resistor ladder is quite literally a group of resistors connected in serial. You can use this configuration either as a "voltage splitter" or in other words a voltage divider or potential divider, or as a way to do digital to analog conversions. The way I'm going to be using it is to put switches off of every junction between the resistors and connect this to ground. Then run an ADC (analog to digital conversion). Because the resistor ladder splits the voltage depending on which switch is closed, you can compare the digital value that's output and from that work out which switch is closed. It's a handy way of running multiple switches off of a single microcontroller pin. I'll be posting more about this, including circuit diagrams, really soon. Hi David, that’s a good question. A resistor ladder is quite literally a group of resistors connected in serial. You can use this configuration either as a “voltage splitter” or in other words a voltage divider or potential divider, or as a way to do digital to analog conversions.

The way I’m going to be using it is to put switches off of every junction between the resistors and connect this to ground. Then run an ADC (analog to digital conversion). Because the resistor ladder splits the voltage depending on which switch is closed, you can compare the digital value that’s output and from that work out which switch is closed.

It’s a handy way of running multiple switches off of a single microcontroller pin.

I’ll be posting more about this, including circuit diagrams, really soon.

]]> By: David http://howardsandford.com/blog/electronic-robot-car-l293d-5v-motors-attiny-avr/comment-page-1/#comment-4 David Thu, 24 Dec 2009 18:21:18 +0000 http://howardsandford.com/blog/?p=51#comment-4 Wat do you mean about resitor ladder? I havnt heard of it before Wat do you mean about resitor ladder? I havnt heard of it before

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