Let's Make Robots!

analog

Robot Size and Methods of Obstacle Avoidance

I realize that most LMRians are going to have more experience with smaller robots and that I am in the minority here, but for the few that have similar or greater experience with big boys (or relevant experiences and insights from or in related fields) I wondered if I could see if you've noticed the same trends as I have in terms of larger (greater than 25cm in any dimension) Robs and effectiveness of various kinds of near-surface detection.

drive,"talk" to my other robot
Using a
hi there. my 1st robot, OK my 5th robot. first was just spining junk.:) i built this junk bot at sunday evening, because i was bored. it will send signals with ir … Read more

give

give me a tutorial to build a analog line follower robot 

Hello! Just found out about LMR a week ago and I've learned so much already! This is a great community and a big thanks to all the people contributing to the … Read more
My iteration at building the famous MouseBot, originally (Mousey, the Junkbot?) created by Randy Sargent. I present to you YUMBBBBMH (Yet Un-named Mouse Bot Being … Read more
Hi, I am ALF, short for Analog Line Follower. I am not an alien, i do not eat cats and i am pretty much earth based, more precise silicon based ;-) Ok, this was the … Read more
This is a simple robot that I made for my cousin, it only uses 2 LDRs, 2 geared motors, and a 555 timer IC. I reused a Tamiya Tank tread kit and gearbox for … Read more
Demonstrates non-numerical associative memory and learning.
Using a
Greetings! This first post will be an attempt to introduce one of the projects I've been working on lately. Read more
So, this challenge is for anyone! From analog guys to digital guys. Only thing you should make is get leds turn on and off alternately, when you switch on and off … Read more
Follows a wall until a light turns off/on
Using a
**Update 9/27/2012**      Finally got around to adding a whisker to the robot that I'm happy with, it helps the robot get stuck far less then before, also it … Read more
Analog Robot Controller
Hello! I made a pcb for Aivot - analog robot controller Parts: 2x 2N3904 1x ferric chloride mix 1x printed circuit Lots of pictures: Printed circuit and piece of … Read more
Analog, Serial, Motor Control, Audio, Video, Xbee, Bluetooth, PWM... Everything!
Chris was nice enough to send me a little project of his called the 444AVXB. Why the weird name? Well, because it does EVERYTHING. 4: amps of motor driver power (2 … Read more

analog to digital converter

dose any one know how or were i can get a cheap analog digital converter?

 

Measuring voltage with an Arduino

I was wondering if I could measure battery voltage simply by hooking the battery's + to an analog Arduino pin so that my robot can know when it's low on power. From what i've understood, a battery of 1.5 volts is dead when it outputs 1.4 volts (gonna do some research about this). I guess I can apply this approximation to different voltages battery. The only problem is that, if I want to use a battery with voltage superior to 5v (Arduino analog pins set 5v as a maximum), how do I divide the voltage? Again, I guess I'll need op-amps to do that and voltage dividers, but what do I exactly do?

Connecting Multiple Microcontrollers

I was wondering if it would be possibly to connect multiple microcontroller IC's by there I/O ports?

BEAM robotics

This is a forum where you can comment about BEAM robotics!

Follows the light from a lighter
Using a
Hi, My name is Zuzu, I live in my masters pocket and usually I sleep at day, but at night, when all the lights goes out, I will wake up and I will seek the most … Read more
Basic principles in PCB design
I thought this could come handy. EMI and power surge problems are common in digital circuit design. The following list is a compilation of suggestions I have … Read more

Multiple swithces to analog input?

Just had an idea. I'm planning to use a LOT of (tactile) switches on a walking robot. For instance I wanna put several under each foot. But it seems like a waste of pins to use a digital pin for each switch (or use multiplexers). So I thought I might be able to connect the switches in paralel and read several at a time from an analog input using resistors of different sizes connected in serial with each switch. Like this:

switches_s.jpg

combined analog input

Ahoy me hearties!

I'm working on a bot that will have a lot of sensor requirements. It must be able to sense objects both at the top and the bottom of the frame. Since I don't want to have to keep track of 8+ sensors, I was hoping to combine some of the sensor inputs.

For example, the bot will react the same to an object sensed at the bottom as one at the top, can I combine them?

Will this schematic work? And if so, will the adc reading be a sum of both sensors, or merely the highest one?

ldr.gif

Follows a line without a brain
HD-Bot is my first intend in building robots. His name is is derived from his chassis, which is an an old hard disk case. There is no controller onboard, the motors … Read more

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 ?