kopia lustrzana https://github.com/SnkMtn000/Arduino-RFM69HCW-GPS
58 wiersze
2.7 KiB
Plaintext
58 wiersze
2.7 KiB
Plaintext
Notes and disclaimer on the Osh Park Board:
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This is not a perfect board. I'll be the first to admit this. It most certainly has short commings. It is designed
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to use an arduino pro mini board of the 3.3v flavor. Do not attempt to use a 5.0v version of this board as
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the Hope RFM69HCW will be destroyed.
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1) The SMA foot print I found online is not a perfect match. The copper pad for the signal pin on the back
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of the board needs to be exposed. I do this by gently scraping off the coating with a knife. I also found I had to
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cut off two grounds and bend the signal pin to get it to fit the tickeness of the board. May just be the cheap SMA
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I got online!
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2) I inadvertainly place the pin assignments for GPS backwards meaning it needs to be mounted on the back of the board.
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Refer to JPGs.
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3) The foot print for the Arduino pro mini 3.3 volt has plated through holes that are not connectd to anything.
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The only plated through holes that should be used are the two rows of header as shown in the photos.
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4) I could not find a foot print for the RFM69HCW and rolled my own. I will publish OSH Park files here
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at a future date including my foot print.
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This board is designed for the RFM69HCW, 433 or 915 MHz chips. It will not work with any other variation
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of the RFM69xxx family. It will not work with LORA chips. It most certainly will not work with an
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RFM22b!!!!!
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Assembly:
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1) The boards I recieved work perfectly . I recommend assembly in this order.
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2) Ring out the bare board before assembly. Why not? If you do not know what that means google it.
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3) Tin with solder one corner pad only. Place the rfm69hcw follwing the orientation as printed on the board.
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Heat and relow the solder to stick the IC to the board. Make sure it is oriented evenly on each pad before
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continuing.
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4) Once happy with the orientation solder another corner pad but more securely. The a third pad. The go back
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and ensure the first pad you soldered had a good elctrical bond. If not reflow again.
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5) Solder every other pad and give it time to cool. Go back and finish solder the rest of the pad.
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6) I next solder onthe 2 12xpin headers. I like headers for socketing the arduino. It allows reuse. BUT,...
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the beast way I found to do this was to first put pins on the arduino, then press the headers on the pins,
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then into the board and solder as above.
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7) The board requires the serial adapter to program but can operate with the GPS using a 5V-12V battery
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on the RAW pin, on the P1 header.
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8) If it does not work out of the can, then please ring it out again. It is not impossible to have
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created a solder bridge between pads of the rfm69 or...an open due to not enough solder between pads.
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:)
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Good luck.
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