Rev2 of LoRa Pager.
Work in progress ;-)
Low Power Long Ra nge Transceiver Module
Microchip MCU 32BIT 256KB FLASH 48TQFP
LCD COG GRAPH 128X64
Graphic LCD Display Module Transflective Black (White - Inverted) FSTN - Film Super-Twisted Nematic Parallel/Serial 128 x 64 NHD-C12864LZ-FSW-FBW-3V3
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5Volt-Junkie 02/08/2019 at 18:49 •
The schematic is almost done. Just need to add some information to part properties. Now I can start with the PCB design. The dimensions of the board will be about 100x70mm big (3.9x2.76inch).
I already ordered a couple of components, because I had to create some libraries and it's also a good feeling to having some real components while working on the project :-)
5Volt-Junkie 01/27/2019 at 21:35 •
Started with the power management today. A couple of month ago, I found a very interesting ic from ST, the
SRC0. It's a small on/off controller, which can be connected to a SMPS, so the power supply can be enabled / disabled by a simple press of the push-button. Furthermore it has an input for external signal, to disable the power (e.g. from microcontroller).
For the SMPS I would like to use the TI TPS63001 buck-boost converter. It provides a fixed +3,3V voltage output @ >1000mA current output (Vin = 2.6 - 4.2 VDC). In this voltage range and at ca. 100mA load, the efficiency stays >90%, which is not so bad :) For the charging circuit I'll use MCP73831. The circuit will be powered by 1 LiPo cell.
5Volt-Junkie 01/26/2019 at 23:33 •
After playing around with the first Prototype of LoPSy (LoRa Paging System ;-) ) and the first range test went well, I wanted to start with a new hardware revision.
The first hardware prototype contained a Nokia display, AI-Thinker Ra-02 433 MHz LoRa module and an ATmega328 µC.
For the new hardware revision I would like to replace the mentioned components and add few more functions.
SMPS instead of linear regulator 1-cell LiPo charger IC
ATSAMD21 microcontroller (compatibility with Arduino Zero MKR (and Adafruit Feather?)) Get rid of the Nokia Display uSD-card tiny pager motor buzzer to be defined...
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