Search found 66 matches

by MySolderIsOlder
Mon Jun 03, 2019 10:39 am
Forum: Antweights
Topic: Team Antiquarian new build diary
Replies: 9
Views: 638

Re: Team Antiquarian new build diary

Hmm...
Some interesting thoughts there. Might not give up on the silicone tubing tyres just yet then, least not until I've done some more tests (narrower tyres and/or cut-in treads).
Thanks guys.
by MySolderIsOlder
Fri May 31, 2019 3:24 pm
Forum: Antweights
Topic: Esc and Receiver
Replies: 10
Views: 391

Re: Esc and Receiver

Best thing I've found for bending Polycarb is a cheap sheet-metal clamp, like welders use. These are the ones I got; https://www.amazon.co.uk/Silverline-633638-Sheet-Metal-Clamps/dp/B000LFV9UO/ With those, I can bend 1mm pc with a little effort by pressing against the workbench - and 1.5mm with a bi...
by MySolderIsOlder
Fri May 31, 2019 1:45 pm
Forum: Antweights
Topic: Team Antiquarian new build diary
Replies: 9
Views: 638

Introducing PolycarbonAnt

With AWS 58 approaching fast, I thought it was about time I made a couple of antweights for my own team, rather than just for my son. So here's my first entrant - PolycarbonAnt - a rough and ready, hard-wearing 4wd invertible pushbot, hand-bodged out of (predictably) polycarbonate. Emphasis very muc...
by MySolderIsOlder
Fri May 31, 2019 1:12 pm
Forum: Antweights
Topic: Team Antiquarian new build diary
Replies: 9
Views: 638

Re: Team Antiquarian new build diary

Well that was a bad idea! The slick silicone-hose wheels looked great - and worked great for the first few minutes. But once they picked up even a hint of dust, all traction disappeared. In a fighting arena, that design will be utterly useless - so reinventing the wheel is now on hold until the day ...
by MySolderIsOlder
Fri May 31, 2019 12:43 pm
Forum: Antweights
Topic: Team Pompidou First Antweight Build/Questions
Replies: 25
Views: 1619

Re: Team Pompidou First Antweight Build/Questions

Is this a bit clearer?

Image

The four wires leading to the Rx are
Brown (Ch1 - Gnd)
Red (Ch1 - Vcc)
Orange (Ch1 - Signal)
Orange (Ch2 - Signal)

Don't worry - we've all been there!
by MySolderIsOlder
Mon May 20, 2019 10:08 am
Forum: Antweights
Topic: Pre modded servo boards for escs?
Replies: 30
Views: 1254

and another thing...

OK, promise this will be my last update on this thread (if anyone's still reading) Treated myself to an el-cheapo servo tester (HJ Digital Servo Tester - 7 quid from Amazon) to see if I could get a bit clearer about the discrepancies I was observing between these different servo boards. Results were...
by MySolderIsOlder
Wed May 15, 2019 7:43 pm
Forum: Antweights
Topic: Pre modded servo boards for escs?
Replies: 30
Views: 1254

Re: Pre modded servo boards for escs?

So finally... just tested the other type of Feetech FT90R esc as arrived today; what I’ll call the “Feetech short board”. Good news is it’s got a clean dead band and supplies full voltage to the motor. Bad news is that the proportional response sucks - not much gradation between off and full throttl...
by MySolderIsOlder
Wed May 15, 2019 9:58 am
Forum: Antweights
Topic: Pre modded servo boards for escs?
Replies: 30
Views: 1254

stop press

Doh! Just after I hit submit on that last update, postman arrived bringing a second batch of 10x Feetech FT90R servos, with which I was planning to build up my stock of "Poor Man's Nano" controllers. And guess what? Yup - totally different boards from the last batch. This time, instead of the longer...
by MySolderIsOlder
Wed May 15, 2019 9:02 am
Forum: Antweights
Topic: Pre modded servo boards for escs?
Replies: 30
Views: 1254

Test results

Regarding the differing experiences when testing the Doman servo boards, thanks to Mike (Ant Ipodean) the mystery is solved. He very kindly airmailed me one of his stock of Doman boards to test. When I repeated my tests using Mike's board, my observations were the same as his, i.e. there is a clear ...
by MySolderIsOlder
Sun May 12, 2019 10:33 am
Forum: Antweights
Topic: Follow up on Digital CR Servo Board ESCs
Replies: 13
Views: 427

Re: Follow up on Digital CR Servo Board ESCs

Ps.
Obviously no onboard mixing so here are the mix settings I used on the Spektrum;

Image
Image
by MySolderIsOlder
Sun May 12, 2019 10:30 am
Forum: Antweights
Topic: Follow up on Digital CR Servo Board ESCs
Replies: 13
Views: 427

Re: Follow up on Digital CR Servo Board ESCs

Since bench tests are no substitute for the real driving experience, yesterday I knocked up a rough and ready test bot, based on a simple 4wd pusher, to see how the Feetech servo board-based ESC would perform. https://i.imgur.com/tAH7ZJo.jpg https://i.imgur.com/17boUwH.jpg Suffice to say, I’m deligh...
by MySolderIsOlder
Fri May 10, 2019 4:08 pm
Forum: Questions (and answers)
Topic: N20 motor rating
Replies: 4
Views: 492

Re: N20 motor rating

Sorry for the dumb question but how does one measure the stall current? Is it simply a case of connecting a DMM in series with the motor, powering up, then stopping it from turning? I have a cheapo autoranging Neoteck DMM and I'm comfortable using it for voltage/resistivity/continuity testing but I'...
by MySolderIsOlder
Wed May 08, 2019 8:49 am
Forum: Antweights
Topic: Follow up on Digital CR Servo Board ESCs
Replies: 13
Views: 427

Re: Follow up on Digital CR Servo Board ESCs

For the hard-core chip spotters among you... With the aid of a stereomicroscope and careful side-lighting, I managed to decipher the almost invisible writing on the two chips mounted on the Feetech controller board. The microcontroller is a 20-pin quad-flat package marked 3AQ20 The other chip, is a ...
by MySolderIsOlder
Tue May 07, 2019 9:45 pm
Forum: Antweights
Topic: Follow up on Digital CR Servo Board ESCs
Replies: 13
Views: 427

Re: Follow up on Digital CR Servo Board ESCs

Hi LimaHotel,

Got mine from AliExpress, here;
https://www.aliexpress.com/item/10-Piec ... 44958.html

Postage seems to have gone up since I ordered
by MySolderIsOlder
Tue May 07, 2019 3:40 pm
Forum: Antweights
Topic: Follow up on Digital CR Servo Board ESCs
Replies: 13
Views: 427

Re: Follow up on Digital CR Servo Board ESCs

Hi Mark, There are two 8-pin DIP chips on that board - one on either side. On the side where the leads are soldered there's one marked 'FZMOS-5X 20160720'. Pins 5 and 8 are soldered to the motor leads. The 8-pin DIP on the other side is absolutely unmarked - checked under microscope and there's noth...