Search found 375 matches

by MarkR
Sun Mar 18, 2018 6:11 pm
Forum: Questions (and answers)
Topic: BBC robot wars cancelled.??
Replies: 9
Views: 7974

Re: BBC robot wars cancelled.??

Because Strickly Come Dancing isn't going to get cancelled, right? I thought RW was very popular in ratings and was in a good slot. Maybe it was expensive to make? PLUS after three series of the reboot, they almost got it right, it was actually fun and not cringe-inducing to watch. Except for the fo...
by MarkR
Fri Mar 16, 2018 8:43 am
Forum: Antweights
Topic: Mark's Antweight build
Replies: 64
Views: 88964

Re: Mark's Antweight build

A really quite bad picture. The white heatshrink is convering a MPU6050 IMU board. The Dasmikro is in black heatshrink stuffed underneath that. The white wires were the ones which came with Dasmikro ESC, but shortened a great deal. The other wiring is basically invisible in this picture. It will be ...
by MarkR
Thu Mar 15, 2018 11:52 pm
Forum: Antweights
Topic: Mark's Antweight build
Replies: 64
Views: 88964

Re: Mark's Antweight build

Ok, So the good news - the DasMikro did not melt, and runs the Raspberry Pi, and the Pi can drive the motors. The Pi now sort-of fits in the robot (which fits in the cube, I think). The wheels stay on, the battery will fit. I've got some 300mAh lipos which are clearly massively overspec, I would def...
by MarkR
Tue Mar 13, 2018 10:06 am
Forum: Antweights
Topic: Yet another new guy!
Replies: 20
Views: 19012

Re: Yet another new guy!

Miniature cable ties?

I'd drill a couple of small holes in the flipper lid and fit a tiny cable tie (wire wrap might do too)

If it's polycarbonate or similar, glue seems unlikely to stay stuck for long, especially hot-glue.

Mark
by MarkR
Mon Mar 12, 2018 8:23 am
Forum: Antweights
Topic: Mark's Antweight build
Replies: 64
Views: 88964

Re: Mark's Antweight build

That's quite a nice H-bridge board, it doesn't require a second 5v supply, could run directly from the Lipo voltage, which is nice. I'm not sure about the current capability though. The h-bridge chip SN754410 is apparently quite good (and supports the 3.3v logic level, which is important) - but need...
by MarkR
Sun Mar 11, 2018 7:09 pm
Forum: Antweights
Topic: Mark's Antweight build
Replies: 64
Views: 88964

Re: Mark's Antweight build

Hi, I'm not using the Arduino environment, but yes, it's working so far, the DasMikro powers the Pi and drives a motor without making any smoke, no lipo-related incidents so far. On the Raspberry Pi it's possible to program in any language - my code will be partially reused from a previous (non-comb...
by MarkR
Sat Mar 10, 2018 11:53 pm
Forum: Antweights
Topic: Mark's Antweight build
Replies: 64
Views: 88964

Re: Mark's Antweight build

Update: I wired up the battery, Raspberry Pi and DasMikro ESC, with a single motor (to test). It powers the Pi just fine. But I couldn't work out why it wasn't driving the motor. I did some investigation with an oscilloscope, but everything looked hunky-dory... I tried various pulse widths on the ou...
by MarkR
Fri Mar 09, 2018 4:41 pm
Forum: Antweights
Topic: Mark's Antweight build
Replies: 64
Views: 88964

Re: Mark's Antweight build

Arduino pro mini does not have a built in radio or wifi, it's going to be a pain to do what I want. I think the Pi is a good choice if I can make it work mechanically; it's perhaps a bit delicate, especially the sd card (I'm investigating whether it can run without the sd card).

Mark
by MarkR
Fri Mar 09, 2018 2:55 pm
Forum: Antweights
Topic: Mark's Antweight build
Replies: 64
Views: 88964

Re: Mark's Antweight build

There is not much weight in the electronics, but there is a little more than in a typical rx / esc combination. The Raspberry Pi Zero weighs 9g with sd card. I haven't quite worked it out yet, I expect there to be a lot of weight in "other" category (fastenings, tyres, wires, ) - also 6x m...
by MarkR
Fri Mar 09, 2018 12:26 pm
Forum: Antweights
Topic: Mark's Antweight build
Replies: 64
Views: 88964

Re: Mark's Antweight build

Wiring diagram