Tag Archives: gris

Custom slider controls in Scratch

To acquire user input for the Scratch version of Grisbot’s computer interface, I’m using slider controls. In the above example, I’ve made a ‘slider icon’ in the form of a red ‘I.’ Position the mouse over the icon and hold … Continue reading

Posted in Uncategorized | Tagged , , , , | Leave a comment

Mini grisbot test status

I have completed screen-to-photocell calibration and control code transfer. Mini grisbot passes both with flying (or at least hopping and skipping) colors. The remaining test phase is to calibrate the servo timings to execute the path as shown on the … Continue reading

Posted in Uncategorized | Tagged , , , | Leave a comment

Dual Sensor Mode in Processing

Here is GRIS in Processing, revised to accommodate dual sensor mode communications between the computer and robot. The square on the left flashes data, while the square on the right flashes the clock signal. Each data bit lasts two frames. … Continue reading

Posted in Uncategorized | Tagged , , , , | Leave a comment

Dual Sensor Communications Protocol

Photoresistors are cheap, and the ATMega328 chip has spare analog pins, so why not use a dual sensor configuration for the GRISbot communications protocol? Here’s what the sensor cowling looks like with two photoresistors (aka LDRs) inside: Likewise the screen … Continue reading

Posted in Uncategorized | Tagged , , , , , | Leave a comment

Protocol Layers for GRIS Communications

Years ago, I tried to read a book on telecommunications protocols. I didn’t get very far before learning that there were such things as ‘protocol layers’ that made the subject a lot more complex than simply translating voltages (or light … Continue reading

Posted in Uncategorized | Tagged , , , | Leave a comment

GRIS bot photos

Here she is, the integrated prototype. Note the cowling is fastened on the back and that the breadboard has just the ATMega328, not the whole entire Arduino board. An overhead view showing the arrangement of the servos, wheels, breadboard, and … Continue reading

Posted in Uncategorized | Tagged , , , , , , , , | Leave a comment

GRIS bot circuit diagram

I’ve been working on this thing for months now, and it seems rather odd that only today did I think to make a circuit diagram. I think this is correct. I’ll get around to posting a photo soon too and … Continue reading

Posted in Uncategorized | Tagged , , , | Leave a comment

GRIS Calibration Flow Chart

I spent an hour working on this chart tonight. It shows the calibration procedure program flow. I don’t expect anyone to follow it, this is basically for my own edification when I (attempt to) write the code tomorrow. I sure … Continue reading

Posted in Uncategorized | Tagged , , , | Leave a comment

GRIS Light Calibration

For some time now, the biggest roadblock to implementing my robot has been with screen communications. Now and then the path data transfer procedure works perfectly, other times it doesn’t work at all. I suspect it has something to do … Continue reading

Posted in Uncategorized | Tagged , , , | Leave a comment

Mintduino Blink Test

Finished assembling Mintduino. The ATMEGA328 chip not only has the Arduino bootloader, it also has the LED blink sketch pre-installed, so when the battery was attached to the Mintduino, the Green LED started to blink. Tomorrow: attaching the FTDI cable … Continue reading

Posted in Uncategorized | Tagged , , , | Leave a comment