I got this module from AliExpress from a here-today-gone-tomorrow vendor with the development board with Dupont sockets and screw-down blocks for each pin. Total of about $7 for the pair. It looks like a nice development setup that I won’t lose sleep if I bury the development board in the final device. Pinout Notes GPIO Input Output Notes… Read More »
It’s always a pain finding the manuals for test equipment. You might use it for a little while then you don’t need it for 6 months. The perfect solution is to put it where you can always find it quickly. Hmmmm. FG085 miniDDS Function Generator This generator is almost entirely based on the kit that is sold all… Read More »
Expressif main site documentation Locally Hosted Documents Just to aid finding ESP32 documents more conveniently, I wanted to bring some items locally – if I use them in a project for instance. General ESP32-WROOM-32 (Not recommended for new designs)
The MCP2221x is used to allow a host computer to communicate with hardward via USB. The interface chip does not require any onboard logic to provide a bidirectional UART, and I2C interface. Using the appropriate host driver software to communicate to the chip, you can configure the remaining 4 GPIO pins as up to three 10-bit ADCs, single… Read More »
This was a really annoying error that popped up initially when I started developing PlatformIO applications with the ESP8266 variants on my Ubuntu Linux laptop. I kept thinking the problem was that Ubuntu had bad drivers for the CH34x USB-to-Serial chip on the NodeMCU (and other) devices. There is lots of information on the web about patching the… Read More »
This documents an attempt to build a test application on a laptop with Ubuntu 22.04 installed. The target is an open hardware NodeMCU (Lua) ESP8266 board with an ESP-12E Wi-Fi module and CH340G USB-to-serial driver chip. Setup the Edit/Build Environment Test Project #1 – LED Blinker Plug in a NodeMCU, ESP-12E, or other ESP8266 device, build then upload… Read More »
The ESP8266 is a System on Chip (SoC), manufactured by the Chinese company Espressif. The central processor is a Tensilica L106 32-bit microcontroller unit (MCU) and a Wi-Fi transceiver. It has 11 GPIO pins and an analog input also. Note that the ESP8266 chip itself has 17 GPIO pins, but 6 of these pins (6-11) are used for communication with the on-board flash memory chip.… Read More »
This open source hardware variant is intended for development. It has an ESP-12S to provide with more pins available for makers but is to be treated as if the module is an ESP-12E. See my post on the ESP-12E for all the information. Additional Information
Some of the sites for information on the ESP3266 line of processors integrated into PCBs is Elecrow (site may not work), Utmel Electronics and Electronics Hub. This excerpt compares and contrasts the devices. Other modules specifications at Ai-Thinker Technology. Good source for pin functionality and tutorials at Random Nerd Tutorials. ESP8266 is a low-cost and high-performance wireless SOC,… Read More »
Datasheets for items I have used in projects for quick reference. ICs AT24C32 – Atmel 2-Wire (I2C) Serial EEPROM, 4096/8192 8-bit words (Module using part) DS3231 – Extremely Accurate (I2C) RTC/TCXO/Crystal (Module using part)