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Posted on by Jean-Luc Aufranc (CNXSoft) - 2 Comments on Meshtastic Mesh Networking Project Combines ESP32, LoRa and GPS Radio

Meshtastic Mesh Networking Project Combines ESP32, LoRa and GPS Radio

ESP32 GPS LoRa

Meshtastic is a project using off-the-shelf, inexpensive ESP32-based hardware with GPS & LoRa connectivity to create mesh networks helping hikers. skiers, paragliders, or people exercising other outdoor activities communicate short messages such as their GPS location. This allows each member of a private mesh network to see the location and distance of all other members and read/or any text messages sent to a group chat. No phone is required unless you have an ESP32 LoRa board without GPS in which case it would get the GPS coordinates from your phone over Bluetooth. A phone is also needed to send a message. The project currently works on three different boards TTGO T-Beam, TTGO LORA32 and Heltec LoRa 32. The T-Beam is recommended as it sells for around $26 plus shipping and features a 18650 battery holder so you can source the battery easily locally. Just make sure to purchase the right […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 6 Comments on $18 TTGO T-Wristband DIY Arduino Programmable Smart Bracelet Features ESP32-PICO-D4 SiP

$18 TTGO T-Wristband DIY Arduino Programmable Smart Bracelet Features ESP32-PICO-D4 SiP

TTGO T-Wristband

2020 is promising to be an interesting year for low-cost user-flashable smartwatches/bracelets. After the recent introduction of the $25 Pine64 PineTime Bluetooth enabled wearable companion for PinePhone Linux smartphone that will support various real-time operating systems such as Zephyr OS or FreeRTOS, we’ve now been informed that Liliygo launched TTGO T-Wristband smart bracelet powered by Espressif Systems ESP32-PICO-D4 SiP. The watch comes with 802.11 b/g/n WiFi 4 and Bluetooth 4.2 Classic+LE connectivity and is currently selling for under $18 and up on Aliexpress and Tindie. TTGO T-Wristband smart bracelet specifications: SIP – ESP32-PICO-D4 system-in-package with ESP32 Tensilica LX6 dual-core processor, clocked at 240MHz, 520 KB SRAM, 802.11 b/g/n HT40 Wi-Fi,  integrated dual-mode Bluetooth (classic + low energy) Display – 0.96″ IPS color display Antenna – WiFi / Bluetooth ceramic antenna Sensor – Invensense MPU9250 9-axis motion sensor Expansion / Programming Interface – 0.3pitch 13-pin FPC socket Misc – NXP PCF8563 […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 4 Comments on TTGO Micro-32 is a Tiny ESP32-PICO-D4 Module

TTGO Micro-32 is a Tiny ESP32-PICO-D4 Module

TTGO Micro-32 vs ESP32-WROOM-32

Unveiled almost a year ago, ESP32-PICO-D4 SiP (System-in-Package) combines ESP32 wireless processor, 4MB SPI Flash, a crystal oscillator, as well as some passive components, and allows more compact or thinner designs such as found in ESP32-PICO- Kit v4 development board. However, so far I had not seen any ESP32-PICO-D4 module, but TTGO Micro-32 fills the void as a compact module based on the SiP. TTGO Micro-32 module specifications: SiP – Espressif Systems ESP32-PICO-D4 based on ESP32 dual core processor + 4MB SPI flash Connectivity – Bluetooth 4.2 LE and 802.11 b/g/n WiFi up to 150 Mbps with chip antenna and u.FL (IPEX) connector Expansion – Castellated holes with GPIO, ADC, DAC, VP/VN, Touch, UART, I2C, and power signals Supply Voltage – 3.3V Dimensions – 19.2 x 13.3 mm (45% smaller than ESP32-WROOM-32) There’s no specific software for the module, since it should be software compatible with ESP-WROOM-32 (now called ESP32-WROOM-32). […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 10 Comments on Design ESP32 LoRa GPS Tracker Applications with TTGO T-Beam Board

Design ESP32 LoRa GPS Tracker Applications with TTGO T-Beam Board

TTGO-T-Beam

TTGO introduced a small ESP32 LoRa board with OLED display last year that is still selling  for around $14 shipped. But the company is now back with a similar board called TTGO T-Beam that does without the display, but adds GPS support, and a 18650 battery holder, so it should be ideally suited for all sorts of LoRa GPS tracking applications. TTGO T-Beam board specifications: SoC – Espressif ESP32 dual core Xtensa LX6 processor with WiFi and Bluetooth Memory – PSRAM Storage – 4MB SPI flash Connectivity 802.11 b/g/n WiFi up to 150 Mbps +  Bluetooth 4.2 Classic and LE with “3D antenna” soldered on PCB LoRa 433, 868, and 915 MHz versions with SMA antenna Transmit current – 120 mA @ +20dBm; 90 mA @ +17dBm; 29mA @ +13dBm Receive sensitivity -139dBm with LoRa & 62.5Khz & SF=12 & 146bps -136dBm with LoRa & 125Khz & SF=12 & 293bps […]

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