STM32?
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Cool!
- Cheaper
- Faster
- More memory
- More storage
- 5v and lots of 3V lines
Any downsides? How stable is the 3V line? Does it use more power?
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This board just keeps getting better and better.
Is there a way to try out this new functionality? I coincidentally could really use a 3.3 volt Arduino with micro-USB port.
I don't like that the Pro Mini doesn't have a micro usb port for powering it. The Digispark Pro does have it, but I don't know if MySensors supports it. More importantly, it's twice as expensive.
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This board just keeps getting better and better.
Is there a way to try out this new functionality? I coincidentally could really use a 3.3 volt Arduino with micro-USB port.
I don't like that the Pro Mini doesn't have a micro usb port for powering it. The Digispark Pro does have it, but I don't know if MySensors supports it. More importantly, it's twice as expensive.
@alowhum a bit off topic, but I've bought a few micro usb connectors to be able to use the ubiquitous phone chargers to power Pro Minis.
To try out the new functionality, order a few STM32. Then use the master MySensors branch from github. https://github.com/mysensors/MySensors/pull/795 will probably have been merged by the time your boards arrive :) If they haven't you can use tekka's branch.
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Also, little sidenote, it's low power mcu i think, maybe not pico like 328p. And i don't know about the mysensors sleep functions (not implemented yet i think).
But that said, it's a nice competitive alternative, like others ARM mcus which are very versatile :yum: (a bit more advanced than simple 8bit 328p) .Big thx to @tekka for his work on this nice addition, you rock :+1:
Digispark pro may run mysensors, for very simple, no big memory task as it's using a smaller mcu than 328p for instance (i don't remember if attiny85 implementation has already been released).
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Also, little sidenote, it's low power mcu i think, maybe not pico like 328p. And i don't know about the mysensors sleep functions (not implemented yet i think).
But that said, it's a nice competitive alternative, like others ARM mcus which are very versatile :yum: (a bit more advanced than simple 8bit 328p) .Big thx to @tekka for his work on this nice addition, you rock :+1:
Digispark pro may run mysensors, for very simple, no big memory task as it's using a smaller mcu than 328p for instance (i don't remember if attiny85 implementation has already been released).
Cool! I'll try that with the one I have already. In my sketches I try to make a non-sleep option, so the lack of sleep should not be a problem. Heh, funny sentence.
Will I also need to install the STM32 library?
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but for a battery powered sleeping node it is better a mini pro that hasn't the usb chip that drains power, right?
@gohan Regarding of battery powered system...
From STM32CubeMX power consumption calculator, it has the following current requirements:
In RUN mode:
- at 72MHz bus frequency, it needs 27 mA
- at 16MHz and HSI PLL, it needs 6.8 mA
- at 8 MHz and HSI, it needs 4 mA
- at 1 MHz and HSI, it needs 900 μA
- at 125 kHz and HSI, it needs 480 μA
In STANDBY mode with all clocks off, it needs 2 μA
In SLEEP mode:
- at 125 kHz bus frequency and HSI, it needs 410 μA
- at 1 MHz bus freq. and HSI, it needs 440 uA
- at 8 MHz, it needs 600 μA
Enabling the following peripherals, additional consumptions are (as for example):
- GPIOA needs 833.75 nA
- GPIOD needs 816.25 nA
- I2C needs 1.25 μA
- SPI1 needs 590 nA
- TIMER1 needs 2.92 μA
- TIMER2 needs 4.06 μA
- TIMER4 needs 3.99 μA
- USART1 needs 1.49 μA
- USART3 needs 1.53 μA
- USB needs 2.22 μA
- Window watchdog needs 312.5 nA
- Independent watchdog needs 1.71 μA
- ADC1 needs 162.19 μA
These are just some examples, not all possibilities and frequencies are listed here...
There are also lower power STM32 series anyway.
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The patch has just been added to the Mysensors Development branch, so it's easier to try out.
I've created a guide on how to get started on the SMT32Duino forum.
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Heh, the STM32 doesn't have a digital pin 2 it seems. Where is the NRF supposed to connect to instead?
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That's odd. I thought I had it just figured out. I'm about to test this at the top of a sketch:
#define MY_RF24_CE_PIN PB0
#define MY_RF24_CS_PIN PA4
#define MY_RF24_MOSI_PIN PA7
#define MY_RF24_MISO_PIN PA6
#define MY_RF24_SCK_PIN PA5
#define MY_RF24_IRQ_PIN PB10The fun thing is all the pins are almost in a row. Almost. And if the IRQ is A3, then one more pin would line up..
According to this image the IRQ is pin PB10 though:
http://wiki.stm32duino.com/images/a/ae/Bluepillpinout.gif -
That's odd. I thought I had it just figured out. I'm about to test this at the top of a sketch:
#define MY_RF24_CE_PIN PB0
#define MY_RF24_CS_PIN PA4
#define MY_RF24_MOSI_PIN PA7
#define MY_RF24_MISO_PIN PA6
#define MY_RF24_SCK_PIN PA5
#define MY_RF24_IRQ_PIN PB10The fun thing is all the pins are almost in a row. Almost. And if the IRQ is A3, then one more pin would line up..
According to this image the IRQ is pin PB10 though:
http://wiki.stm32duino.com/images/a/ae/Bluepillpinout.gif@alowhum sorry I misread your question. Don't know why, but I didn't see that you were talking about the NRF.
IRQ is not used for the NRF on Arduino, so I supposed it is not used for STM32 either. There is nothing about IRQ in https://github.com/mysensors/MySensors/pull/795/commits/ac432acca3d7c58eb7c8f569dc562860605ea09f#diff-cf14b6301beb3a4dbaded9b95bb190feR487
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Really? On the Arduino nano I'm always connecting it to pin 2. It says to do so in the guide?
Anyway, I haven't been able to get it to work. Perhaps some of the developers van shed some light on how it's supposed to work?
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Really? On the Arduino nano I'm always connecting it to pin 2. It says to do so in the guide?
Anyway, I haven't been able to get it to work. Perhaps some of the developers van shed some light on how it's supposed to work?
@alowhum The MySensors RF24 driver is a polling driver (unless RX queuing is enabled), hence no IRQ required.
I've successfully tested the RF24 radio with this wiring on a BluePill board using MySensors 2.2.0-beta:
CLK -> PA5
MISO -> PA6
MOSI ->PA7
CSN -> PA4
CE -> PB0do not forget to set:
#define MY_RF24_CE_PIN PB0
