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Forum Index : Microcontroller and PC projects : picoMite: ulra low power for battery operation pico has two modes?
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| Amnesie Guru  Joined: 30/06/2020 Location: GermanyPosts: 396 |
Hello, I've testing the picoMite for an ultra low power operation but the manual says: so I tried: -Turn off obboard LED (Heartbeat) -CPU SLEEP (not much of a difference) -CPU SPEED (down to 48000Mhz - huge difference but not enough!) So with NO additional components (only the pico) I am drawing 0,057W (sadly not enough!) Now I am reading all over the internet (and datasheet) that it is indeed possible to send the pico in two modes of low power consumption: normal "sleep mode" and "dormant mode" (externally triggered wake up required) It is possible if you do the math for way more efficiency: 4.3 mW in Sleep Mode and 2.7 mW in Dormant Mode. Is there a reason this isn't built into MMBASIC? Greetings Daniel Edited 2024-01-05 23:43 by Amnesie |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6792 |
The RP2040 isn't the best choice for low power systems. As the Raspberry Pi Pico itself isn't all that efficient I don't think much priority has been put on saving power. More important to squeeze as much performance as possible out of it. If you want *true* low power operation there are far better systems. Have you considered the Micromite? 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: 4234 |
Daniel, Look at a picaxe (08M2). There is a report on the web of some guy that ran it for 7 years on 3 AAA batteries...flashing a LED. Volhout Edited 2024-01-06 00:53 by Volhout PicomiteVGA PETSCII ROBOTS |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9115 |
If you need a low power application use the stm32L range. The ArmmiteL4 (running MMBasic) can get down to 1.8uA in sleep mode. I'm not wasting time trying to get low power out of a chip that isn't designed for it ( apparently there are issues getting out of dormant mode for RAM resident code). 390uA seems to be the limit for the RP2040 - different ballgame to the ST range Note also the Pico board uses power. The spec says the minimum with the RP2040 in dormant mode is 0.8mA Edited 2024-01-06 01:07 by matherp |
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| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 396 |
Hello and thank you all for your replies! I was just asking because I am reading that it is possbile down to 1.4mA even by using microPython. (Micropython (custom firmware) picosleep.seconds 1.4mA) https://ghubcoder.github.io/posts/deep-sleeping-the-pico-micropython/ But no problem, I was just curious why it isn't implemented .. but Peter delivered the answer ... there are RAM issues, I see...  But I am glad that you implemented a way to clock DOWN the CPU, that already drops the consumption a lot. So thanks for that feature! Edited 2024-01-06 01:15 by Amnesie |
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| Amnesie Guru Joined: 30/06/2020 Location: GermanyPosts: 396 |
Other microcontroller are not an option, because I am using it on my android mobile phone for programming on the way (connecting the Pico USB OTG via adaptor with a Serial To USB app installed) This way I can programm the pico via serial and using the Phone as input device :) It also gives some power. Works great! So the main reason for choosing the Pico over other microcontroller is the ability to connect the pico right to my mobile phone and use it as a "programmer" via USB tu Serial on the way. Edited 2024-01-06 01:26 by Amnesie |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6792 |
One of the smaller ESP32 devices might be a possibility for portable programming, but it's not MMBasic. I've not tried it with a phone. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3150 |
No reason why ESP32 with Annex would not work that way. And once set up, if separately powered, you can use any PC/laptop/cromebook/phone to program the ESP32 in Basic with a browser without any connecting wires at all--no worry about draining your phone's battery. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 859 |
How about ArmMite L4 + (something like) HC-05 and program via Bluetooth? Serial console on the L4, BTW. Oh wait...not even sure what the L4 even is...I have the F4  Edited 2024-01-06 04:41 by PhenixRising |
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