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Forum Index : Microcontroller and PC projects : jwettroth's post re MX170
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| Volhout Guru  Joined: 05/03/2018 Location: NetherlandsPosts: 4715 |
Going back to MX170 Lizby...?? The backpack is pin compatible with the Huntron tracker "aka the backpack tracker". You could build that one as well. Board layout must be here somewhere on the forum... Volhout Edited 2025-03-12 00:42 by Volhout PicomiteVGA PETSCII ROBOTS |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4715 |
For the power supply I am designing I use the zero, becuase it has 4 ADC's, and a linear regulator. This allows the use PWM to set the power supply output voltage/current. For the frequency counter I use the regular Pico, since it has more pins, I need. And with its buck/boost switcher I can run the whole counter of 2xAA batteries. It is all in system design.... Volhout Edited 2025-03-12 00:55 by Volhout PicomiteVGA PETSCII ROBOTS |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3252 |
Only really to look at ultra-low current draw. With the chip being out of stock in covid times, there has been little interest on the forum, but there have been clues that CaptainBoing and others were working away with the design all along. I thought it good to look at the current state of this MMBasic chip, and to see what was available in the way of PCBs. (I have to say, when the PicoMite came out, I was very grateful to have an inexpensive MMBasic module which could be programmed and run from USB.) ~ Edited 2025-03-12 01:59 by lizby PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| al18 Senior Member  Joined: 06/07/2019 Location: United StatesPosts: 218 |
Glad JLCPCB resolved the quote - the rendering looks OK. |
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CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 2120 |
OK, I had a big session on this friday. The gerbers are currently with JLC where I am getting a small run of ten boards done - you may want to wait until I get them back and build one up but if you can't wait or just want to see, I attach the ZIP here (the schematic is in there too) SILMk2b.zip Remember I have not played with this other than what I see in Eagle. I am sure some of my routings will make other whince. The board is the next generation of my "compute module" which is a SIL board about 2.5" x 1.25". It takes up a tiny amount of space, exposes 19 bits of contiguous IO, the reset and an on-board generated 3.3V. Options are not have the regulator in which case you'd be expected to provide 3.3V to the relevant pin or to the VIN pin (and link SJ2) I tried to get this to be as useful as possible and the Tx output from the console (which is the Rx input to a PC/master has provision for a small diode so that many of these devices can be linked together with a pull up on one of them (R1). This provides very simple multi-drop so if you wanted to create a cluster/star network, it becomes laughably easy. Obviously there is no built in protocol for making sure the right module talks at the right time etc, but that is the fun of the journey - I have a published protocol of FotS that would adapt very easily. In theory, there is practically no limit to how many of these modules you could link and the prospect of making a distributed system is realistic. It wouldn't be hard to convert this to wireless (e.g. 433MHz) or CAN but I have to draw the line somewhere. The board has provision for an AMS1117 3.3v SOT223 regulator and DS3231 RTC + Battery so would be very happy as a standalone board. If you want to bolt a few together you probably wouldn't want this on all of them, in which case you'd omit IC2 & IC3. There is room for a Winbond flash (type) memory chip which means you got up to 16MB on this if you want. I think I am going to knock together a little beowulf cluster (seems a popular buzz word) and write some distributed computing software just for s&g... I have no reason to other than to play and keep the brain ticking along... imagine a row of these all paralleled-up, each with their own address being given chunks of a problem to work-on and a central supervisor dishing out the work and collating the results - don't come at me with any "what's the point?" arguments... the point is it's do-able with my own stuff, my way and not an OS or 3rd party library in sight. For the journey! Edited 2025-03-24 02:51 by CaptainBoing |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3252 |
Thanks very much for this. For $4.24USD, I've taken the risk. Got to order some parts, too. Very cool. Journeying on. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 2120 |
I built one of those too - forgot  very useful box - it turned a huge chunk of work on a bag of "mixed zeners" into an enjoyable 15 minute canter. It also taught me that zener voltages are waaaay more "nominal" than I expected, but that then lead to the happy accident of finding three for the crowbar(s) on the PSU on my build plate heater that meant I could drop the power in the event of an over voltage way below the 3.6V absMaxV on the 170... the spread of values got me to spot on 3.5V for the critical VCC - cheers Volhout h Edited 2025-03-24 03:14 by CaptainBoing |
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| CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 2120 |
Sorry Lizby/all bad top silk SILMk2b.zip if ordering JLC, cancel and resubmit the file h |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3252 |
No problem--cancelled and reordered. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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