OpenSprinkler Forums Hardware Questions OpenSprinkler Pi (OSPi) Raspberry Pi OSPi Model Guide

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  • #67548

    jptaranto
    Participant

    Mods: something got messed up with my first topic post, so I’m posting this again. Please delete the first post if it shows up for you.

    I’d love to make this a complete guide post about which Raspberry Pi models are ideal to use with the OSPi board. But I’m still pretty unclear about the pros/cons. Here’s what I’ve got so far:

    RPi 1 Model A
    Enclosure not compatible
    Powered by OSPi AC transformer
    No WiFi

    RPi 1 Model B
    Enclosure not compatible
    Powered by OSPi AC transformer
    No WiFi

    RPi 1 Model A+
    Enclosure not compatible??
    Powered by OSPi AC transformer
    No WiFi

    RPi 1 Model B+
    Powered by OSPi AC transformer
    No WiFi

    RPi 2 Model B
    Powered by OSPi AC transformer
    No WiFi

    RPi 2 Model B 1.2
    Powered by OSPi AC transformer
    No WiFi
    64-bit

    RPi 3 Model B
    Needs separate DC power supply
    2.4 GHz WiFi
    64-bit

    RPi 3 Model A+
    Enclosure not compatible??
    Needs separate DC power supply
    2.4/5 GHz WiFi
    64-bit

    RPi 3 Model B+
    Needs separate DC power supply
    2.4/5 GHz WiFi
    64-bit

    RPi 4 Model B
    Needs separate DC power supply
    2.4/5 GHz WiFi
    64-bit

    RPi Zero PCB v1.2
    Powered by OSPi AC transformer
    No WiFi
    No GPIO header (needs to be soldered on)

    RPi Zero PCB v1.3
    Powered by OSPi AC transformer
    No WiFi
    No GPIO header (needs to be soldered on)

    RPi Zero W
    Powered by OSPi AC transformer
    2.4 GHz WiFi
    No GPIO header (needs to be soldered on)

    I’d love some input on which model Pis are being used and any pros/cons that you’ve come across.

    There are so many Pi models and specs vary widely, and with cost increases due to COVID it could even be wise to use a 1 or 2 B model.

    Raspberry Pi spec sheets: https://en.wikipedia.org/wiki/Raspberry_Pi#Specifications

    #67550

    Ray
    Keymaster

    Thanks for the list. My understanding is that RPi 1 Model A or B (which has 2×13 pins) has long been discontinued, I am not sure where to buy them actually. All other RPis use 2×20 pin header, and should fit in the current enclosure. This includes RPi 1 model A+, which also uses 2×20 pin header.

    Also we have started shipping OSPi version 1.5 since a few weeks ago. Version 1.5 uses an improved switching regulator and can provide up to 2amp current on +5V line so should be able to drive all RPis without needing external USB power supply.

    Though, technically, to really deliver 2amp it would draw quite a lot of current from the input 24VAC adapter as well. For example, to deliver 2amp @ 5V and assuming 70% efficiency of switching regulator, it will need to draw about 600mA from the input 24VAC, which is a significant amount.

    • This reply was modified 1 week, 3 days ago by Ray.
    #67566

    jptaranto
    Participant

    Oh that’s great news Ray! Cheers for that. I just bought a couple of OSPi boards last week, so I’m really looking forward to getting them setup. I’m yet to buy the RPis, however I went ahead and bought a couple of 24vac 1.87amp transformers. So they should do the job of powering the RPi (if I go with a 3 or 4) and a number of valves simultaneously.

    #67567

    jptaranto
    Participant

    Looks like there’s a redirect issue when I try to edit the original post.

    #67591

    psmedley
    Participant

    I’m using a Pi Zero here – I can’t remember if I soldered the header myself or ordered one with the header on it already.

    #67648

    jptaranto
    Participant

    I ended up going with a RPi 1 A+. I’ll be using a USB wifi adapter with an antenna. Hoping it’s got enough power via it’s usb port to work from 50m away from the external AP.

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OpenSprinkler Forums Hardware Questions OpenSprinkler Pi (OSPi) Raspberry Pi OSPi Model Guide