Let's Make Robots!

I2C

connecting an i2c device with an AXE020 project board.

I've been thinking about playing around with 

What should be the resistance between clock, and data on an I²C bus?

trying some i2c devices, though they aren't working, so i thought maybe they where shorting, my cheap multimiter reads 3kohm, is it suposed to be like this?

the device is a cheap ebay nunchuck, made myself a wiichuck adapter with vero board, though i'm measuring the resistance directly from the original socket, so it's not my homemade adaptor thats causing the probems...

 

thanks 

i2c = PS/2?

Hi, can i connect i2c interface devices to my computer, by using the PS/2 jack?

thanks 

 

 

 

Explore an environment, create maps, take pictures, never get stuck.
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Dual 18F4620 board with supporting 18F2525 for display

Right now I am working on my master-slave-slave board that will suit my needs for a long time. It has a master 4620, that communicates to another 4620 for processor assistance.

 4620 MASTER: Spaces for 5 servos, rs232, I2C, sn754410 motor controller, 8 ADC channels, 2x5 header so it is expandable into another board.

4620 SLAVE: Setting switches, proximity IR sensors (8 for complete sensing), speaker, encoders (rear and front for a car drive bot, left and right for 2 wheel operation), 38khz IR led driver, bumper switches and spaces for 6 servos I2C.

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I2C vs Serial

I hereby submit another plea to the robot gods out there:

I've read a lot of very informative info on both i2c and serial communication as a way for one IC to control others. My question is: which will work better for my needs?

My plan is to make a robot that has a seperate IC for each aspect of its behavior (movement, communication, etc.). So which is faster? cheaper? fewer wires? easier to program? I'm sure both have pros and cons.

Okay, go.

Price: $12.9 USD
If you've been thinking your robot needs more memory or the ability to record/playback sounds like Frits's Drum machine or even if you just want to play with i2c … Read more
Tips on EEPROMS, i2c, scratchpad and variables
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Analog multiplexor (possibly i2c)

Hello! i have almost finished my analog inputs on my last project.. i have only one left and i need to attach some potentiometers to do some calibration.. I could really use some nice multiplexing. What i'd like is a chip with some analog inputs and possibly an i2c interface so that you can choose which analog pin to read and get a digital reading. Do you know if anything like this exists ?

Problems with i2c (and an LCD display)

So, i just wasted an evening trying to make an LCD with i2c work with my picaxe.

I connected the SCL and SDA of the board to the other end on the LCD. (of course not crossing them :P)  BTW on the picaxe the pins are: Digital input 3 = SCL; Digital input 4 = SDA, am i right ?

If so, other question is: do i need the two pullup resistors ? i've read somewhere that they're already there on the board. But if so, the pin should be high most of the time, shouldn't it ? testing with my voltmeter reads 0V. 

PS i have the picaxe 28x1. 

Price: $4.5 USD
There are a few models of this but the SM125-IC is an RFID Interigator with read/write capabilities and I2C connection capabilities. I have been looking for a chip … Read more
If you're ever in need of additional digital inputs or outputs then this chip may be an answer to your prayers. It only requires two connections from your … Read more