Wireless – Systev

24-May-2023

Firmware update over the air for the ESP32

I just published on GitHub some code which presents one possible way to implement firmware update over the air for the ESP32:

esp32-fuota – Sample application for the ESP32
docker-fuota-server – Sample update server

29-April-202016-March-2022

LoRa and LoRaWAN reference documents

Updated: 16-Mar-2022

LoRa

LoRa modulation basics (from Semtech website)

LoRaWAN

27-April-202016-March-2022

LoRaWAN data rates and payload sizes

Updated: 16-Mar-2022

Data Rate	Configuration	Indicative Bit Rate (b/s)	N
0	LoRa: SF12 / 125 kHz	250	51
1	LoRa:SF11 / 125 kHz	440	51
2	LoRa:SF10 / 125 kHz	980	51
3	LoRa:SF9 / 125 kHz	1760	115
4	LoRa:SF8 / 125 kHz	3125	222
5	LoRa:SF7 / 125 kHz	5470	222
6	LoRa:SF7 / 250 kHz	11000	222
7	FSK: 50 kbps	50000	222

EU863-870 Data Rates – Source: https://resources.lora-alliance.org/technical-specifications/rp2-1-0-3-lorawan-regional-parameters
N: maximum application payload length, in the absence of the optional FOpt control field

25-April-201729-March-2023

Some programmable wireless ICs and modules

Updated: 29-Mar-2023

Some integrated circuits or modules providing wireless connectivity (Wi-Fi, Bluetooth, Public Land Mobile Radio aka 2G/3G/4G, etc.) or satellite positioning, can host some customer code. Below, some of them.

Note (on the 29-Mar-2023): I haven’t been updating this post for almost a year now. It may contain some old references that are no more valid. I will review it some time soon. Continue reading “Some programmable wireless ICs and modules”

18-April-201727-April-2020

SODAQ ExpLoRer and Bluetooth

SODAQ ExpLoRer board includes a Microchip RN4871 Bluetooth module. This post explains how to start using it.

Continue reading “SODAQ ExpLoRer and Bluetooth”

15-April-201727-April-2020

Connecting SODAQ ExpLoRer to Orange LoRaWAN network

This post explains how to transmit data over French Orange LoRaWAN network using a SODAQ ExpLoRer board. Continue reading “Connecting SODAQ ExpLoRer to Orange LoRaWAN network”

27-March-201727-April-2020

Connecting ST LoRaWAN development kit to Orange LoRaWAN network

This post explains how to use ST LoRaWAN development kit to transmit data over French Orange LoRaWAN network. We will use a sample source code from ST, which we will compile and link using System Workbench for STM32, based on Eclipse. Continue reading “Connecting ST LoRaWAN development kit to Orange LoRaWAN network”

17-February-201717-July-2021

IoT device development kits

Updated: 17-May-2021

Here is a list of various low cost programmable boards or kits, with some (wireless) connectivity. This list is maintained on a best effort basis only.

B-L462E-CELL1, from ST: LTE-M/NB-IoT modem, eSIM with prepaid connectivity, accelerometer, magnetometer, humidity, temperature, pressure, etc. – US$ 74 (May-2021)
mangOH, an open-source project from Sierra Wireless – three versions, the mangOH Yellow being the latest one: 2G to 4G & LTE-M/NB-IoT, GNSS, Wi-Fi, BT 5.0, built-in antennas, accelerometer, gyroscope, magnetometer, pressure, humidity, acoustic mic, air Index quality, temperature, and light sensors, battery charger and battery gauge, LEDs, buzzer, touch button, expansion connector, SD card, etc. – from 96 € to 116 €, depending on the model (Jan-2021) – to be considered along with Legato, another open-source project from Sierra Wireless, for the software part
QuickFeather Development Kit, from QuickLogic – FPGA-enabled Arm Cortex®-M4F MCU, 16-Mbit of Flash memory, accelerometer, pressure sensor, PDM digital microphone, integrated battery charger – US$49 (Jan-2021)
M5Stack Core2 ESP32 IoT Development Kit for AWS IoT EduKit – US$42 (Dec-2020)
Thunderboard Sense 2 Sensor-to-Cloud Advanced IoT Development Kit, from Silicon Labs – ARM Cortex M4 core with 256 kB RAM and 1024 kB Flash, multi-protocol radio, sensors, source code of applications for Android, iOS and web – US$21 (Dec-2020)
Icarus IoT Board, from Actinius – based on the nRF9160 – LTE-M / NB-IoT, GPS – 99.50 € (Dec-2020)
Thingy:91, from Nordic – based on the nRF9160 – LTE-M / NB-IoT, GPS, 16 sensors, Bluetooth / Thread / Zigbee / ANT, plastic and rubber case – around 111 € (Dec-2020)