EasyEDA User rodyne
rodyne
Public Project: 14 Footprint Package: 58 Likes: 29 Favorites: 25 Views: 14940

LORA data Collection Terminal

4 weeks ago  

License: Public Domain

Status: Complete

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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 Schematic

Handheld Terminal PCB

Handheld Terminal PCB

Attachments

FilenameDownload
4x4 Keyboard Overlay Engineering.zipDownload
Terminal.X.zipDownload
Manual V2.zipDownload

BOM

IDValueQty.PackageComponentsSupplierMolexEast RisingManufacturer PartEasyEDAManufacturer
1100n40805C3,C1,C15,C2
2Connector for MT700PA1FH12-12S-0.5SHBARCODEMolex54548-1271 (or equiv)
31u61206C19,C20,C21,C22,C6,C7
410u51206C18,C29,C4,C5,C8
510020805R5,R10
6Connector for ERC128128-31FPC-31-0.5mm (Reversed - Check b4 use)LCDEast RisingER-CON31HT-1 (or equiv)
7SI2301DS2WSOT-23M2,M3
8100K20805R15,R2
9MCP162511SOT-23-6LU3MicrochipDirect.comMCP16251T-I/CH
10560K10805R6
11330K10805R8
124.7uH1TDK CLF6045NI-DH1TDK CLF6045NI-D 4.7uH
131N4148WS1SOD323FD2
14PIC18F26K20-ESO1SOIC-28U2
15RFM69HCW1RFM69HCW-XXXS2U5
16SP6201EM5-3-0-TR1SOT-23-5U1EasyEDASP6201EM5-3-0-TRE6856SIPEX

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