Hello, This is how I connect a Raspberry Pi to my M100, the little board even looks the same. You can get 5v from the Pi GPIO bus, and the tx, rx, and gnd.
It seems to do OK with the M100 almost RS-232 levels. It doesn't handshake though, but I just run at slower speeds if I'm using the builtin term. Jonathan [email protected] ________________________________________ Från: M100 [[email protected]] för Jim Williams [[email protected]] Skickat: den 22 januari 2020 16:33 Till: [email protected] Ämne: [M100] RS232 to TTL I've been working on my Raspberry Pi recently, trying to connect it to an Adafruit FONA cellular module. The primary communication has been through TTL serial between the two. Recently, I reluctantly switched to USB connection, for speed, which freed up the serial pins on the Pi and on the FONA. I came across this article, "Add a 9-pin serial port to your Raspberry Pi in 10 Minutes" http://www.davidhunt.ie/add-a-9-pin-serial-port-to-your-raspberry-pi-in-10-minutes/ And It occurred to me that I could use one to connect my Pi, or a ZeroW, even, to my M100. Now I'm wondering if I can use it to connect the FONA directly to the M100, forgetting the Pi. It should be doable, since the needed pins are on the FONA. I think it would be cool to be able to log onto my Pi from my M100 (and I can think of several uses people might have for this setup), but even cooler to use the FONA. The FONA also has... uhm... I2C, I think it is, connectors. So other sensors could be connected to it via those connectors, and the M100 could be used as a remote data collection device. I think. Anyway, I picked up a couple RS232-TTL converters, with DB9s and using a Max3232 chip off of ebay for about $12 for both. You can get them a LOT cheaper (under $3.00 US for one), but these gave me the confidence that they wouldn't fail on me. I'll post here any experiences I have once I play with it some. Just thought I'd share on something that was new to me. --- När du skickar e-post till SLU så innebär detta att SLU behandlar dina personuppgifter. För att läsa mer om hur detta går till, klicka här <https://www.slu.se/om-slu/kontakta-slu/personuppgifter/> E-mailing SLU will result in SLU processing your personal data. For more information on how this is done, click here <https://www.slu.se/en/about-slu/contact-slu/personal-data/>
