![Makerfocus D1 Mini NodeMcu 4M Bytes Lua WiFi Development Board Base on ESP8266 ESP-12F N Compatible NodeMcu Arduino]({"https://images-na.ssl-images-amazon.com/images/I/711D%2BbR8iyL._SY450_.jpg":[450,450],"https://images-na.ssl-images-amazon.com/images/I/711D%2BbR8iyL._SX679_.jpg":[679,679],"https://images-na.ssl-images-amazon.com/images/I/711D%2BbR8iyL._SY355_.jpg":[355,355],"https://images-na.ssl-images-amazon.com/images/I/711D%2BbR8iyL._SX569_.jpg":[569,569],"https://images-na.ssl-images-amazon.com/images/I/711D%2BbR8iyL._SX425_.jpg":[425,425],"https://images-na.ssl-images-amazon.com/images/I/711D%2BbR8iyL._SX466_.jpg":[466,466],"https://images-na.ssl-images-amazon.com/images/I/711D%2BbR8iyL._SX522_.jpg":[522,522]})
I've been using full size (i.e. 30 pin package) NodeMCUs until now, but although these D1 Minis have only 16 pins, you're still getting 10 digital I/O and the one A0 analog pin, a reset pin, plus the ground and one 3 volt and one 5 volt pin. This is enough for most projects. After all, you do get the hardware I2C and SPI pins (on D5 through D8). One bonus is that this D1 definitely fits on a standard breadboard leaving one open hole available for each pin (on both sides) but being shorter than the 30 pin boards you will have about 6 more rows available for prototyping, especially nice when using the short 460 tie point breadboards. I bought the one from Makerfocus because they provide 3 sets of headers depending on how you want to use it (standalone board mount, stackable on top, or stackable top and bottom). You need to solder one set on before you can use the board. Some D1 vendors don't even provide headers. This D1 seems to upload code faster over USB than some of the full length NodeMCUs I got from other vendors (using the Arduino IDE). Definitely going to get more of these for my upcoming projects.
The attached picture shows breadboard space for a full size NodeMCU (left) project and a D1 mini project (right). Note that I could have moved the D1 mini 2 more pins down (to give me 2 more free rows above) but I didn't want the USB port extending beyond the breadboard.
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