Archive for the ‘LoRa’ Category.
07.05.2018, 09:38
Murata produces LoRa module CMWX1ZZABZ-xxx based on SX1276 transceiver and STM32L072CZ microcontroller. The soldering of the LGA module is not very hobby-friendly. I constructed small breakout PCB for this module with additional buck/boost switcher and place for SMA connector. The transceiver features the LoRa®long-range modem, providing ultra-long-range spread spectrum communication and high interference immunity, minimizing current consumption. Since CMWX1ZZABZ-091 is an “open” module, it is possible to access all STM32L072 peripherals such as ADC, 16-bit timer, LP-UART, I2C, SPI and USB 2.0 FS (supporting BCD and LPM), which are not used internally by SX1276.
LoRa breakout board
Continue reading ‘LoRa module in DIL form’ »
02.05.2018, 22:26
This is simple antenna for 868MHz built in 5…10 minutes. Take about 10cm of RG214, a plate of PCB with the copper at one (or both) sides. Remove the coax shield and inner dielectric on one side in length of about 85mm. You will cut this to proper length during SWR measurements.
Simple antenna made with piece of coax and piece of old PCB.
Continue reading ‘Quick and dirty 868MHz antenna in 5 minutes’ »
19.04.2018, 06:52
The described device is nearly matchbox-sized board (50 x 24 mm) packed with sensors. Auxilary board is 10x50mm with additional sensors. The module is developed around the Murata ABZ LoRa module, which integrates STM32L072 and samtech SX1276 in tiny 12.5 x 11.6 x 1.76 mm package. The main board is equipped with following sensors:
- Magnetic compass MAG3110
- Thermometer TMP75 for internal temperature measurements
- MPU unit is MPU6050
- RH and temperature sensor Si7013
Small section of the main board can be separated. There aqre 6 sensor on this part of the PCB:
- Thermometer TMP75
- RH sensor SHT31
- RH, T and pressure sensor BME280
- Another Si7013 for external RH and T measurement
- Ambient light sensor VEML6030
- UV sensor VEML6075
There are two 1Mbit EEPROMs on-board for local data logging. Additional pins are available for SPI, 2x UART and I2C interface, where even more sensors can be attached.
LoRa multisensor module
Continue reading ‘Multisensor LoRa Device’ »
03.04.2018, 08:27
This is description of coaxial collinear antenna for 868MHz applications. I designed this for Lorawan gateway.
Antenna tested with lorawan gateway
Continue reading ‘Collinear antenna for 868MHz Lorawan Gateway’ »
