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Forum Index : Microcontroller and PC projects : ArdoMite
| Author | Message | ||||
Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 7513 |
Sometimes there are daft ideas, other times there are dafter ideas. I think this may be one of the latter. It's for those who are homesick for the Arduino UNO. Actually, it's probably a usable board as the fixing holes and IO connectors line up (even the misaligned one) and they all have signals on them that make some kind of sense, even though the PicoMite is lacking in the ADC department. This version has both I2C ports available and the ADC pins can be used for the second SPI, connected to the ICSP connector. The UNO never has a built in micro SD socket either. :)  Edited 2022-07-28 02:22 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3998 |
Arduino layout / carrier board - and the Pico is to be soldered to it? John |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7513 |
Yep, basically. Some things just shouldn't be done really. I was bored. :) The PicoMite has to surface mounted or you can't use shield boards with it. That's also why there's no RTC on board and why the micro SD socket is SMD. Of course, you could just use a shield board and solder a PicoMie on, but custom boards are cheap from JLCPCB and you haven't got wire links all over the place. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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Rickard5 Guru Joined: 31/03/2022 Location: United StatesPosts: 463 |
Hey Mick That is Kinda neat, You did hit pay dirt with that idea, nothing daft about that idea! as a guy with about a dozen Arduino based robot kits I've bought over time from bangood, kickstarter, amazon, etc... and haven't done anything with because I'm too stupid to learn C++ and as a college professor once told me "My Ambitions far exceed my abilities" so Yes it's worth the few extra shekels to have a Carrier Board that converts the lovely pico with MMBasic or Python to Uno form factor as a drop-in replacement so I can use that $100 Arm Kit or that $12 3 Wheel Robot Base I may be Vulgar, but , while I'm poor, I'm Industrious, Honest, and trustworthy! I Know my Place |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7513 |
I hadn't considered it as a conversion idea. It makes sense, I suppose. I've never really used the Arduino in anger, is there anything else that it needs (apart from more adc inputs)? Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Rickard5 Guru Joined: 31/03/2022 Location: United StatesPosts: 463 |
Well Mick I know my Place,I'm Vulgar and Poor, and lack innate Breeding, but I have the inclination I could be Middle Class. I Look up to you because your Middle Class, but while I'm poor, I'm industrious, Honest and Trustworthy I do a great many things from Anger :) First one to Identify where that comes from get's the point :) I may be Vulgar, but , while I'm poor, I'm Industrious, Honest, and trustworthy! I Know my Place |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4251 |
"The Frost Report", ask me a difficult one. Best wishes, Tom MMBasic for Linux, Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| Rickard5 Guru Joined: 31/03/2022 Location: United StatesPosts: 463 |
TOM :  I may be Vulgar, but , while I'm poor, I'm Industrious, Honest, and trustworthy! I Know my Place |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7513 |
I've changed it a bit: Changed the barrel jack to a 2.1mm pin type Added the 5V regulator Rearranged the power chain and so that it's like the Arduino now, accepting 7-12V input. Added the TX / RX LEDs. Added a solder blob link on the bottom for 3EN Re-wrote the Arduino IDE in MMBasic. (only joking) EDIT: Added a NPN transistor with base resistor from TP5 (the LED). Transistor is open collector, on spare pin 1 of POWER connector. And now there's a Reset button and AGND can be isolated from GND. . Edited 2022-07-29 08:17 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4854 |
Mick, this is a difficult adventure youre on. The main reason to do this would be the enormous amount of cheap shields that exist for the UNO. These are in many cases very tightly coupled to the atmega328 funtions. So you need spi at pins 11,12,13 You need pwm at pins 5,6,9,10 UART at D0 and D1 You need 6 analog inputs at A1..A5 that can also be used as digital inputs, where A4 and A5 also triple funtion as I2C. And many shields need 5V or supply 5V logic signals. I once rewired a MX170 on an arduino UNO and found little joy sine there where so many mismatches in either signal levels or functions. Edited 2022-07-29 10:51 by Volhout PicomiteVGA PETSCII ROBOTS |
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Quazee137 Guru Joined: 07/08/2016 Location: United StatesPosts: 586 |
I got one of these years ago its in a controller box in cornfield some where in Kansas. Made my own hats to use with it. It was a prototype and they wanted to keep the pumps going so they bought it. The rest of them was in a dinrail boxes. I switched to dinrail to make my controllers easier to deploy.  Had FUN then and having FUN now THANKS to MMBasic. Quazee137 |
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| Rickard5 Guru Joined: 31/03/2022 Location: United StatesPosts: 463 |
Please do not discourage the middle class English Man, the Real reason for doing this is for those of us who lack innate breading or the ability to code C++ but have a bunch of Arduino based robot kits and cases and will have a cleaner neater solution to replace the Slow Complicated Arduino with the far Superior Picomite! :) I may be Vulgar, but , while I'm poor, I'm Industrious, Honest, and trustworthy! I Know my Place |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7513 |
TBH I never considered this to be viable. There's no point whatsoever in building it as the cost of the bits is more than a pre-built Arduino UNO clone, and with the clone you get full compatibility (probably). I'm not on a quest. It's not intended to be electronically compatible (it can't be anyway - not enough ADC pins). It was just a bit of fun when I got bored. :) It is not, and can never be, a drop-in replacement for an Arduino UNO. It's a PIcoMite that's mechanically compatible, that's all. Shields are *supposed* to check IOREF to determine if they are on a 5V or 3.3V platform, as not all Arduino models are 5V compatible. In theory, plugging an Arduino shield into this won't cause damage, but it certainly won't work "out of the box" as MMBasic has no library support. If you want to program an Arduino UNO R3 in BASIC then use GCBASIC. You get fully compatible hardware and a really good, free BASIC compiler. You still have no library support though. At the end of the day it's the massive number of easily installed libraries that make the Arduino family what it is. The hardware is pretty mediocre really. EDIT: I think there might be a release version at some point, however it won't be mechanically or signal compatible with the Arduino. Rectangular PCB (no silly shapes), all connectors on 0.1" centres and deliberately positioned to not allow Arduino shields to be fitted. It does make a nice little general purpose board though, that can be powered from 12V and output 5V and 3.3V supplies to external equipment. There's no reason why it couldn't have it's own shield system, all the supplies and signals are there. It might be slightly narrower too, at 50mm, to get two out of 100x100. I'll have to think that one out. Edited 2022-07-29 17:45 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7513 |
Pin correlation: (Tidied up a bit) Arduino ArdoMite UNO R3 1 Blank TP5 transistor collector 2 IOREF (3.3 or 5) 3V3 Input voltages shouldn't exceed this. 3 PC6 - Reset RUN 4 +3V3 3V3 5 +5V 5V 6 GND GND 7 GND GND 8 VIN VIN 9 PC0 - A0 GP26/ADC0 10 PC1 - A1 GP27/ADC1 11 PC2 - A2 GP28/ADC2 12 PC3 - A3 GP13 No A3 onPicoMite 13 PC4 - A4 GP14/I2C2_SDA No A4 on PicoMite 14 PC5 - A5 GP15/I2C2_SCL No A5 on PicoMite 15 PD0 - RX GP17/COM1_RX 16 PD1 - TX GP16/COM1_TX 17 PD2 - INT0 GP12 18 PD3 - INT1/PWM GP11/PWM5B 19 PD4 GP10 20 PD5 - PWM GP9/PWM4B 21 PD6 - PWM GP8/PWM4A 22 PD7 GP7 23 PB0 GP6 24 PB1 - PWM GP5/PWM3A 25 PB2 - SS/PWM GP21/PWM2B 26 PB3 - MOSI/PWM GP19/PWM1B/SPI_TX 27 PB4 - MISO GP20/SPI_RX 28 PB5 - SCK GP18/SPI_CLK 29 GND GND 30 AREF VREF Not identical in function. 31 PC4 - SDA GP0/I2C2_SDA 32 PC5 - SCL GP1/I2C2_SCL A3. A4 and A5 are not available. All I/O is at 3V3, not 5V. ----------------------- ICSP Connector 1 MISO2 GP28/SP2_RX Also ADC2 2 5V 3V3 Not the same as Arduino 3 SCK2 GP26/SP2_CLK Also ADC0 4 MOSI2 GP27/SP2_TX Also ADC1 5 RESET2 RUN 6 GND GND Edited 2022-08-02 07:09 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 7513 |
Here it is. ArdoMite and ArdoMite_S ArdoMite is a mechanical replacement for an Arduino UNO R3. ArdoMite_S is the way they should have designed it, with everything on a 0.1" grid. :) They are both the same electronically. The Construction pack includes the Gerbers for both versions. Construction pack.zip   Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Rickard5 Guru Joined: 31/03/2022 Location: United StatesPosts: 463 |
THAANK YOU MICK XOXOXO Remind me to send you a case of Stella I may be Vulgar, but , while I'm poor, I'm Industrious, Honest, and trustworthy! I Know my Place |
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