Let's Make Robots!

voodoobot's blog

Second set of eye's on a sn754410 driver setup

wired up


Note green LED(yes it's set up in the correct orientation and even when I hook up a vmeter I don't see a voltage) is not lit up.(red is power indicator) I feel like amature hour here with this simple circuit yet can't seem to get it to work. Tried 2 different chips. Recommendations are welcome...I only spent this morning looking at it....

UNIO memory breakout board

A few weeks back I aquired some memory chips(samples rock). These are the special unio memory chips, essentually 1 wire for both input and output. As this is an 8 pin chip with only 3 of the pins being useful, I decided to try to make a simple breakout board with some small 5x5 hole pcb boards I grabbed from SF. These unio chips can be used with the20x2, 28x2 and 40x2 and the three pins are vcc, vss and I/O. The chip id is 11aa040(4k memory)

As recommended, I've added a small pullup resistor to the board. This is the results of...


This project is based on my picaxe version of the mini ir beacon.

Some ideas to expand on this are:

Addition of phototransistors to sense an ir signal and aim the com portion of the beacon towards the target. This could be effective for transmitting location data or possibly map dataThe beacon could possibly have a link to a base station to report on bots in the vacinity.

Addition of a distance sensor for inital maping of local. This may be ommited as it adds extra detail that may not be useful.

bluetooth com and processing language rig

These are the source files related to the setup I mentioned in CTC's post about wireless serial com.


Reposting info on the setup just for ref.

Alrighty, ctc, got the rig working. The setup is the following:

<ir beacon> transmitting byte sequence from 1-9

<relay station> picaxe 8m with ir receiver showing correct data in the debug window.

Transmitting the byte sequence received from ir beacon via bt to my desktop running the processing code.

Modifying picaxe8 proto boards to fit your needs.

Since my projects contain a lot of 08m procs, I decided a while back to grab a couple of the proto boards for for fun and experimentation. With these boards I also wanted to be able t o reuse them after doing some experimenting with them as we all know desoldering can be a chore.

So here are a couple of ways I'ved moded the proto boards.

1. Choped the proto side off of the board, added a set of male header pins and rewired the power lines. Also used the proto side of the board for a 6+v to 5v regulated via ldo reg.

mini ir beacon

So this is the mini ir beacon I've had mulling around but never got around to building one....or finally built it. I'll post the current code for this in a bit.

The circuit is pretty basic in that it just uses a picaxe, an ir emitter, led, some resistors and a npn transistor. Ialso wanted to keep it small(hence the mini) so decided to use some lr44 batteries to get around 4.5v out. The battery holder was fashioned out of some 18ga colid copper wire which does a great job of holding things together.

 The setup

Circuit board 90% complete

So this is the first pic when it was about 50% complete, with the picaxe adapter mounted. The jumpers next to the adapter are used to select which picaxe to use when programming. 


The next image is with the pwm circuit that I had worked on, mounted on the main circuit board.

The 08m(empty socket at bottom right) controls the motor pwm control circuit.

The 14m(top center) sends signals to the motor pwm control circuit.

main board updates

update so far.

I've almost finished with the main circuit board. After some consideration, I stuck with the dual 08m and 14m setup.

while waiting for some parts

while waiting for some parts, I've got some little sensor that I'm trying to figure out how it works.

 It's part of the bigger project. the sensor is part of the waypoint navigation system that I'm working on.

dual PWM test

Alright, so I'm just dabling with this stuff, but thought I'd see if I could create a small circuit that could split a pwm signal from a 08m/14m micro into a dual pwm output "for fine control of two motors". I wanted to control the output for each of the two channels even if the same pwm sig would be going to them, at least I could select which channel or channels would be on

This is the image of what it looks like. It has some fine tuning and I'll see about getting a schematic(thats not on a piece of paper).


components that I'm working on at this time -

So these are a couple of the parts that I'm working on. As mentioned in the original bot post, these are the camera side of things. I'm just waiting on parts(arriving friday!) before proceeding with this gear.



--[Areas that I'm going to be focusing on]--

-Steering setup