Technical Details
Mesh Station 2026 (MS26) is implemented with the Wemos Lolin32 Lite which has been discontinued, but MANY clones are still being manufactured and are available widely at ultra low cost.
Note there are TWO versions of Wemos Lolin, MS26 is the cheaper "Lite" version, NOT the "Standard" version:
| Available Pins | Standard version | Lite version (MS26) |
|---|---|---|
| 3V3 | 2 | 1 |
| 5V | 1 | – |
| GND | 5 | 1 |
| RX/TX | 2 | – |
| GPIO | 21 | 21 |
MS26 has with 2 rows of 13-pin holes (2 rows of headers are supplied but NOT soldered on). Many other Mesh Stations are available if you want a Mesh Station with soldered in headers or you do NOT need the built-in battery charger in your Mesh Station.
Schematic
sch_lolin32_lite_v1.0.0.pdf (86.5 KB)
Datasheet
Espressif_Systems_01292021_esp32-1991551.pdf (965.5 KB)
PlatformIO
- Board Name: lolin32_lite
- Documentation: WEMOS LOLIN32 Lite — PlatformIO latest documentation
1. Processor
The processor is a ESP32-D0WDQ6.
• ESP32-D0WD chip - Dual Core but No Flash
• Xtensa 32-bit LX6 microprocessor
• Floating Point Unit
• DSP instructions (32-bit multiplier, a 32-bit divider etc.)
• 32 interrupt vectors from about 70 interrupt sources
• JTAG for debugging
Internal Memory
• 448 KB of ROM for booting and core functions
• 520 KB of on-chip SRAM (for data and instructions)
• 8 KB of Fast SRAM in RTC
• 8 KB of Slow SRAM in RTC
• 1 Kbit of eFuse: 256 bits for the system (e.g. MAC address) 768 bits for custom applications
Internal Network
• WiFi 802.11b/g/n
• WiFi 802.11n (20 MHz and 40 MHz)
• WiFi up to 150 Mbps of data rate
• WiFi up to 20.5 dBm of transmitting power
• Bluetooth v4.2 BR/EDR and Bluetooth LE
• Bluetooth Class-1, 2, 3 transmit power with dynamic control up to 24 dB
3. Other Components
Flash
Flash Size: 4MByte (32Mbit)
LED
General Purpose LED can be controlled on GPIO-22
Charging LED
References
-
Introduction
ESP32 WeMos LOLIN32 Lite high resolution pinout and specs – Renzo Mischianti -
More Details
Lolin32 Lite - DONE.LAND -
Micropython
GitHub - chenull/lolinara: Ini adalah board lolin esp32 yang sudah terinstall micropython punya nara -
Great video for hardware geeks
https://www.youtube.com/watch?v=s2JAqwg4udY -
Interesting controversy on the charging circuit
https://www.youtube.com/watch?v=a9f9vHjQSfQ