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LORA data Collection Terminal

11 months ago 554
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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

Handheld Terminal PCB


ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted LCSC Molex East Rising Microchip Direct
1 100n C3,C1,C15,C2 0805 4 0805F476M100NT FH LCSC C108658
2 Connector for MT700PA BARCODE FH12-12S-0.5SH 1 LCSC C21531 54548-1271 (or equiv)
3 1u C19,C20,C21,C22,C6,C7 1206 6 1206F105M500NT FH LCSC C1926
4 10u C18,C29,C4,C5,C8 1206 5 1206B106K160NT FH LCSC C39127
5 Backlight Connector BL HDR1X2 2MM 1 LCSC Yes PH-2AW
6 100 R5,R10 0805 2 0805W8J0101T5E UniOhm LCSC C25277
7 Connector for ERC128128-3 LCD FPC-31-0.5MM (REVERSED - CHECK B4 USE) 1 East Rising ER-CON31HT-1 (or equiv)
8 SI2301DS M2,M3 WSOT-23 2 SI2301CDS-T1-GE3 VISHAY LCSC C10487
9 100K R15,R2 0805 2 0805W8J0104T5E UniOhm LCSC C25611
10 Battery 2XHIMH-AA-BAT HDR1X2 2MM 1 LCSC Yes PH-2AW
11 MCP16251 U3 SOT-23-6L 1 MCP16251T-I/CH
12 560K R6 0805 1 0805W8J0564T5E UniOhm LCSC C25637
13 330K R8 0805 1 0805W8J0334T5E UniOhm LCSC C25629
14 4.7uH H1 TDK CLF6045NI-D 1 SLF6045T-4R7N2R4-3PF TDK LCSC C93218
15 1N4148WS D2 SOD323F 1 1N4148WS SEMTECH LCSC C57759
16 PIC16F18857 U2 SOIC-28 1 PIC16F18857-I/SO Microchip Direct PIC16F18857-I/SO
17 SP6201EM5-3-0-TR U1 SOT-23-5 1 SP6201EM5-3-0-TR SIPEX LCSC C6856


Filename Download
4x4 Keyboard Overlay
Lora Terminal.jpg

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