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LORA data Collection Terminal

11 months ago 554
  • Description
  • Documents
  • BOM
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Description

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.

Documents

Handheld Terminal Schematic

Handheld Terminal PCB

BOM

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 MicrochipDirect.com
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

Attachments

Filename Download
4x4 Keyboard Overlay Engineering.zip
Terminal.X.zip
Lora Terminal.jpg
Manual V2.zip

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