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LORA data Collection Terminal copy copy

9 months ago 49
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Note there is a semi-completed Manual for the design attached which explains the circuit (its a zipped PDF)

This is an update to my original 2015 design, based on a new customer who wanted a 868Mhz LORA compatible system. The changes are:

  1. Uses 2 x AA batteries and boost converter. Power off consumption about 70uA and typical battery life of two weeks
  2. Replaced CPU with the lower cost PIC16F18857 (56KB Flash / 4KB RAM) and internal clock
  3. Moved back to 125Khz RFID (EM4100) but this time used a new module which retails for US$2.20 (MOQ=50) with 61x35mm coil antenna which fits in the space under the keyboard and on top of the battery compartment
  4. The RFM95W 868/915Mhz LORA Module is used with a spiral antenna, range is 300M+ in factory environment. Note that the RFM69 module is pin compatible and can be used in place of the LORA module if required.

The BOM Cost still well under US$100 including:

a) The membrane keyboard ($7ea zipped PDF overlay engineering drawings attached) b) The MT700PA 3.3V 2D Barcode module ($30ea) and C) The custom cut case. This is based on the 1357025mm szomk 2xAA battery holder plastic handheld enclosure with transparent front. if you order a MOQ of 50 you can specify the cutouts for the LCD and keyboard cable

The test firmware is also attached (As a Microchip MPLAB-X Project). This is work in progress as the client is doing most of the software design but does cover power management, keyboard, LCD, barcode, RFID reading and sending out a test message. There are plenty of public domain libraries for using the RFM95/RFM69 modules.


Handheld Terminal Schematic copy copy

Handheld Terminal PCB copy copy

LCD Spacer copy copy




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