A Mini weather station based on ESP-12. Include a BME280 or BME680 sensor chip on board, one or more DS18B20 onewire sensors. It's powered by a Lithium cell, can be for short time directly charged over present voltage input. A LDO with very low Iq included. Comes with voltage measurement for the connected battery. Hardware jumper for deep-sleep and a programming connector (charge the battery if +5...
A ESP-12 IoT controller for RGB LED Stripe 5-12V.
3+1 channels through MOSFET, PWM and dimming functionality.
The MOSFETs can be replaced by NPN Power transistors (input resistors are as THT parts placed, the 10k pull down's not needed.
The 4th channel is a Logic level up-converter (3.3V->5V). Driven by a 2N7002, can be replaced with BSS138 or similar. Note that it's is a very small power output...
I got sick of wiring up ESP-12 on the simple breakout boards to external devices where you needed extra VCC and GND connections. The nodeMcu version have the built in serial and regulator that are not much good for low power.
So this is my alternative, focused around I2C and mainline I/O with VCC and GND close by, as well as options for configuring the reset pin, for wake up and external
So far I have not found an ESP development module which can be inserted to a socket sideways e.g. to save PCB footprint (for use in smaller enclosures) and to increase module density (e.g. in a HPC application / ESP cluster / multi-ESP configurations).
Here is one design I created (feel free to use/modify/improve/etc).
I wish that some day a manufacturer realizes its potential and creates a produc...