Recent content by Shack

It seems that World Education (and their other name) was sort of run out of business when the market got diluted by Rev-Ed and now they are impossible to contact. They always had good service, fair pricing and shipping. Spark Fun has everything marked up +10% above retail so they can offer a...

I want to use a Picaxe to control the speed of an AC motor (fan). I know, I know but I am qualified to use the main power so that is not the issue. I already tried a 12 starter motor but it did not work ... too slow. What I want to know is if folks think it is possible to use a relay of sorts...

I am using a 24LC512 EEPROM. My stock has been used before and has random data and I need to make it blank like a new one. Is there a trick or simple way to quickly erase the entire EEPROM? I am writing 10 byte blocks now but it takes a long time. Thanks

I have a code section I can not figure out. What I want to happen is every time the code enters this section I want to write a number to EEPROM. The desired numbers are from 0-9 (10) and written sequentially. I am preloading the EEPROM with a start number of 0. I tried (–1) but that did not...

Does anyone know what a wide band 02 sensor outputs and how to interpolate that voltage into a air/fuel ratio? I see allot of them for sale and thought it might be a fun project to make one myself. Thanks

Update: I have confirmed on another board that I can see the oscillator on Pins 9/10. So, this one has a problem which is quite suspicious. ++++++++++++++++++++++++ On a 28x part with an external crystal should you be able to see this with a scope on pin 9 or 10? My chip is acting...

I am new. I don't know how to write a word value to an external eeprom and then get the value back correctly so I can display it on an LCD screen. I know the mechanics of writing and reading the EEProm, but I don't understand how to break the Word value into two Byte values for storage...