Search found 195 matches

by MarkR
Fri Jun 21, 2019 8:12 pm
Forum: Events
Topic: What to bring to AWS (advise for first timers please)
Replies: 6
Views: 129

Re: What to bring to AWS (advise for first timers please)

Remember the transmitter :)

If you use a rechargeable transmitter, remember to bring the charger for it / charge it up. They probably last more than a couple of fights, but it's better to be safe than have it fail just before a bout.

Mark
by MarkR
Fri Jun 21, 2019 10:34 am
Forum: Antweights
Topic: Mark's Antweight build
Replies: 55
Views: 5451

Re: Mark's Antweight build

Just particularly shiny aluminium :)

Mark
by MarkR
Fri Jun 21, 2019 8:16 am
Forum: Antweights
Topic: Mark's Antweight build
Replies: 55
Views: 5451

Re: Mark's Antweight build

Pictures of Stacie in "final" configuration

Image

Image
by MarkR
Tue Jun 18, 2019 12:48 pm
Forum: Antweights
Topic: Team Pompidou First Antweight Build/Questions
Replies: 28
Views: 1733

Re: Team Pompidou First Antweight Build/Questions

Alright I don't have a multimeter so maybe I should get one , I understand some bits of what you saying and some is abit confusing for me but I get what your saying , I have shortened the wires to the motors , would that be the problem? Yes, get a multimeter. Even the super cheap ones will help to ...
by MarkR
Sun Jun 16, 2019 11:41 pm
Forum: Antweights
Topic: Mark's Antweight build
Replies: 55
Views: 5451

Re: Mark's Antweight build

I have now got two robots which are potentially ready for the AWS58 event: * Betsie - has the same design and firmware as for Ant Freeze (with the Raspberry Pi, IMU sensor etc), but with the fault (voltage boost module failed!) fixed. I will also put some new tyres on and redo the flipper. It seems ...
by MarkR
Tue Jun 11, 2019 7:11 pm
Forum: Antweights
Topic: Peter Wallers Robot Ramblings
Replies: 739
Views: 100191

Re: Peter Wallers Robot Ramblings

Looks good, nice big rings around those through-hole pins, much bigger than the ones on the RX.

What design software did you use?

I am assuming it's a single-sided layout, IC3 and IC4 are the rz7899 ? I see the pads connect 5-6 and 7-8

Mark
by MarkR
Sun Jun 09, 2019 6:44 pm
Forum: Antweights
Topic: Team Pompidou First Antweight Build/Questions
Replies: 28
Views: 1733

Re: Team Pompidou First Antweight Build/Questions

Difficult to tell. Do you have a multimeter? If so, set it to resistance and measure the resistance of everything (powered off!) which should have resistance, check for short circuits. A N20 motor should have (idle / stalled) resistance of 6-20 Ohms (mine generally read about 12), if it is much less...
by MarkR
Fri Jun 07, 2019 2:54 pm
Forum: Antweights
Topic: Peter Wallers Robot Ramblings
Replies: 739
Views: 100191

Re: Peter Wallers Robot Ramblings

I'm using the rz7899 in the Malenki ESC. It's a single channel H-bridge in a soic8, I don't find them to be difficult to solder unless the board has too much copper around (particularly the 2 ounce copper). The nice thing about it is that it has a good wide voltage range, quite big claims of max cur...
by MarkR
Thu May 30, 2019 9:49 pm
Forum: Antweights
Topic: Team Pompidou First Antweight Build/Questions
Replies: 28
Views: 1733

Re: Team Pompidou First Antweight Build/Questions

The leads from the RX to Dasmikro are Servo leads, they're designed for servos, so they have power. In the case of the Dasmikro, power is fed back from its regulator (aka BEC) to the receiver. So only one set needs to be connected, they're internally connected together in the RX anyway. The 2nd chan...
by MarkR
Thu May 30, 2019 1:38 pm
Forum: Antweights
Topic: Team Pompidou First Antweight Build/Questions
Replies: 28
Views: 1733

Re: Team Pompidou First Antweight Build/Questions

You don't need to connect more than one power / gnd wire from the rx to the Dasmikro. So those extra wires can be cut off. Yes the soldering is a mess, and is likely to fail unless you tidy it up a bit. Check that you don't have any shorts. Maybe a bit of hot glue wouldn't go amiss, the Dasmikro pad...
by MarkR
Fri May 17, 2019 4:53 pm
Forum: Antweights
Topic: Malenki-ESC open source Antweight ESC
Replies: 18
Views: 910

Re: Malenki-ESC open source Antweight ESC

http://vectrex.org.uk/mark/malenki-kicad.png http://vectrex.org.uk/mark/malenki-irl.jpg Parts are here, I have made a couple of the boards so far. It all seems to approximately work, the firmware at least drives my test robot around. If anyone wants one, please PM me, I can make up about 9ish board...
by MarkR
Wed May 08, 2019 10:09 am
Forum: Antweights
Topic: Follow up on Digital CR Servo Board ESCs
Replies: 13
Views: 454

Re: Follow up on Digital CR Servo Board ESCs

All the dead-band logic is inside the MCU, so good luck tuning it. These tiny little MCUs have their own free-running oscillator which goes at whatever speed it feels like. So the MCU might be nominally clocked at 1 Mhz, but in practice it's 1 Mhz +- 10% or maybe worse than that. So the firmware mig...
by MarkR
Wed May 08, 2019 9:01 am
Forum: Antweights
Topic: Follow up on Digital CR Servo Board ESCs
Replies: 13
Views: 454

Re: Follow up on Digital CR Servo Board ESCs

Good detective work. The AM1096 is a very interesting chip because it's a motor driver with built-in voltage regulator, so it saves them components on the board, the LDO voltage regulator presumably supplies the microcontroller, which makes it a "true" 2-chip solution which can handle a wide range o...
by MarkR
Tue May 07, 2019 4:08 pm
Forum: Antweights
Topic: Follow up on Digital CR Servo Board ESCs
Replies: 13
Views: 454

Re: Follow up on Digital CR Servo Board ESCs

Ok, I didn't realise there were two chips. Probably one is a cheapo no-info Chinese Microcontroller, the other is a motor driver, similar to the MX612. Actually the MX612 has pins 5,8 connected to the motor. Don't run it off more than 10V, it's outside of its spec. I actually bought some MX612s, but...
by MarkR
Tue May 07, 2019 2:57 pm
Forum: Antweights
Topic: Follow up on Digital CR Servo Board ESCs
Replies: 13
Views: 454

Re: Follow up on Digital CR Servo Board ESCs

That is very interesting.

Did you, by any chance, get a part number from the 8-pin chip on the blue ESC board above? The Dorman servo board? Is that the only active part on the board, or is there a small transistor too?

Mark