Search found 191 matches

by MarkR
Fri Mar 29, 2019 10:00 pm
Forum: Antweights
Topic: Malenki-ESC open source Antweight ESC
Replies: 18
Views: 879

Re: Malenki-ESC open source Antweight ESC

Now I have a strange issue. I've got the ESC working and decoding PPM signals. They seem to work ok, my receivers will stop sending pulses when they lose signal, and after a short time then we turn the motors off (as you'd expect) to implement failsafe. I'm now working on supporting serial protocols...
by MarkR
Fri Mar 29, 2019 9:54 pm
Forum: Antweights
Topic: Possible escs ?
Replies: 6
Views: 316

Re: Possible escs ?

Looks plausible, but the description is light on details. Specifically, it has only one (yellow) wire shown to interface to the receiver, without any suggestion of whether this is PPM (combined signal), or something else e.g. S-Bus or I-Bus. I'm guessing it's PPM, because on my RXs the PPM is usuall...
by MarkR
Thu Mar 28, 2019 11:32 pm
Forum: Off-topic
Topic: What is it with Americans and imperial units?
Replies: 8
Views: 1755

Re: What is it with Americans and imperial units?

Unfortunately things get really difficult when you start doing PCB design. A lot of components are traditionally pitched in inches. Popular pin pitch is 2.54mm and 1.27mm (1/10 and 1/20 inch). Also, there is a copper thickness standard called "1oz". I have no idea what that even means, but 2oz is tw...
by MarkR
Tue Mar 26, 2019 5:58 pm
Forum: Antweights
Topic: Pre modded servo boards for escs?
Replies: 30
Views: 1258

Re: Pre modded servo boards for escs?

Yes, I upgraded the firmware via the usb cable, and that added some new options on the menu. NB: this has a touchscreen. Inside nothing much seems hand-soldered, there are a lot of small connectors. It is obviously cheap but quite well thought out and the gimbals feel ok. some features are a bit gim...
by MarkR
Tue Mar 26, 2019 5:23 pm
Forum: Antweights
Topic: Pre modded servo boards for escs?
Replies: 30
Views: 1258

Re: Pre modded servo boards for escs?

I just bought a Turnigy Evolution (Also Flysky protocol), I really like the design of the tx, it's like a game controller. They are very good value. Unfortunately it arrived totally dead, and it wouldn't charge. HK have promised to send a replacement. They didn't want the old one returned, so I open...
by MarkR
Tue Mar 26, 2019 11:11 am
Forum: Antweights
Topic: Malenki-ESC open source Antweight ESC
Replies: 18
Views: 879

Malenki-ESC open source Antweight ESC

Hi, I've designed an open-source hardware Antweight ESC. It is still under development, but I now have my first actual board made. It doesn't work yet because the firmware isn't finished. * Three channels of DC motor drive (maximum current TBC, but should be at least 2A) * Takes PPM/CPPM/ i-bus (and...
by MarkR
Mon Mar 25, 2019 7:14 pm
Forum: Antweights
Topic: Dual motor Axe bot
Replies: 12
Views: 558

Re: Dual motor Axe bot

Yes that sounds like a great idea. Derek Dudge also did something similar with one motor on Manticore, an overhead bolt which bashed the crap out of the other robots, it was very popular with the audience. I would also recommend using a higher voltage, maybe a 3S pack or a voltage boost circuit, to ...
by MarkR
Fri Mar 22, 2019 9:34 pm
Forum: Antweights
Topic: T_Y's Build Log
Replies: 105
Views: 9078

Re: T_Y's Build Log

The capacitor would go between the power and ground, as close as possible to your microcontroller. The idea is, that if there are spikes in the main power supply caused by (e.g.) motors turning on and off, they are smoothed out by the capacitor. As wires have resistance (and inductance), you want th...
by MarkR
Tue Mar 19, 2019 11:41 pm
Forum: Events
Topic: Antweight World Series 58 - 29th June 2019
Replies: 34
Views: 2950

Re: Antweight World Series 58 - 29th June 2019

There is video... https://www.youtube.com/watch?v=CYe_PA5pmVA The arena has partial drop-offs on two sides, but not corners. Some parts have higher walls than others. This is a very good design in my opinion, it allows pushing out of the arena but does not make it too easy; it allows powerful flippe...
by MarkR
Tue Mar 12, 2019 11:05 am
Forum: Questions (and answers)
Topic: Power connectors identification / naming
Replies: 2
Views: 518

Power connectors identification / naming

Hi, Perhaps someone knows the names of these power connectors? Perhaps this message will be useful if we add some info here: 1. The discharge plug on many small 2S and 3S lipo batteries. This is a polarised, usually red, female (on the battery end) connector with a pitch of about 2.5mm (it fits 0.1"...
by MarkR
Thu Mar 07, 2019 5:59 pm
Forum: Events
Topic: Antweight open/AWS 2019
Replies: 23
Views: 1328

Re: Antweight open/AWS 2019

Basingstoke would be really convenient for me. Yes :)
by MarkR
Thu Mar 07, 2019 12:05 pm
Forum: Antweights
Topic: Botbitz 10 amp ESCs for weapon
Replies: 10
Views: 464

Re: Botbitz 10 amp ESCs for weapon

Pneumatics looks a bit complex... Yes, pneumatics is super-difficult, and I have no idea where to get the parts, but, if you pull it off, it is AWESOME... I mean, look at last year's "Anticide", it was super amazing. It was worth it just for the triple-back-flips :) Last year's AWS55 arena was buil...
by MarkR
Tue Mar 05, 2019 8:06 pm
Forum: Antweights
Topic: Botbitz 10 amp ESCs for weapon
Replies: 10
Views: 464

Re: Botbitz 10 amp ESCs for weapon

The 100:1 was a standard aliexpress-or-similar N20 gear motor. I'd say it flips a lot better than a weak or cheap servo, but looking at some of the other Ants at the tournaments, some of the higher spec metal gear servos do flip very well too. I don't know enough about the different models of servos...
by MarkR
Tue Mar 05, 2019 2:06 pm
Forum: Antweights
Topic: Botbitz 10 amp ESCs for weapon
Replies: 10
Views: 464

Re: Botbitz 10 amp ESCs for weapon

I used a 100:1 gear motor for the flipper on Betsie. I over-volted it to 17 volts, it works pretty well. I guess you'd get a really good flip, either by over-volting the motor to 12v (e.g. run on 3S pack, or use a boost module like I did), or by using a "high power" gear motor. The standard gear mot...
by MarkR
Mon Mar 04, 2019 3:44 pm
Forum: Antweights
Topic: Back Again! Knighthood Build Concept
Replies: 2
Views: 280

Re: Back Again! Knighthood Build Concept

I tried a Dasmikro and I wasn't happy with it, it's a pain to solder and mechanically very weak. (Although on the positive side it is *very* small). I then managed to let the "magic smoke" out, possibly by a short circuit from a lifted track. Again - the problems with the Dasmikro are mechanical rat...