WIFI Kit 8 ESP8266 WIFI Wireless 0.91 inch OLED CP2014 32Mb Internet of Things IOT Development Board Module For Arduino IDE NodeMcu

I finally have Micro Python working - with the screen. There really needs to be better documentation available - if you have already flashed with micro python (a task in itself), setup up ampy, copied over the ssd1306.py file and connected with putty (phew), then you can try the program below - it worked for me - note the pins and the need to set the oled rst pin to high...import machine, ssd1306pin16 = machine.Pin(16, machine.Pin.OUT)pin16.value(1)i2c = machine.I2C(scl=machine.Pin(15), sda=machine.Pin(4))oled = ssd1306.SSD1306_I2C(128, 64, i2c)oled.fill(0)oled.text('Hello World', 0, 0)oled.show()

The board arrived a lot quicker than i was advised. However, although as pictured, it did not contain the LoRa bit (long range wireless communication). Not a problem for now but i will get one at some point if the Amazon descriptions are to be trusted.It's a bit of a struggle to find specific documentation but robotzero.one saw me get the github stuff and download the additional bits to my Arduino IDE. There are examples of sketches then to be found in the IDE, so i uploaded one to draw stuff to the screen and that worked and taught me how to write my own messages to it. So pleased with how it's going.To upload you need to press and hold the prg button, press the rst button, then release the prg button. The screen will black out and it waits for the upload to start.I probably would give it 5 stars if it had been as billed.It came with program pre installed that showed it picked up my wifi and then demoed the display.

Very quick delivery, worked perfectly out of the box.If you need documentation ask the seller, they provided one in a matter of two days.The pin design is different to one on github webpage for Heltec kit 32 (Heltec-Aaron-Lee/WiFi_Kit_series) so be aware of this.The documentation they have sent has the right pinout scheme.Example usage you can find by googling "robotzero heltect wifi kit 32"OLED display works very well with U8g2 library. WIFI and Bluetooth (BLE) are also working well.It works also with led fading (google ESP32 Arduino: LED PWM fading).In short, this is a very good product and customer service.

The board is a great size and it's good to have the screen and battery connector. Watch the pinouts - the labels on the board are right but not on the picture.The OLED is a bit delicate, I managed to break one of them- used on another project that didn't need the screen.I'm having some battery problems. With cells showing 3.7V open circuit the board wont start up. Looking at the schematic I think the diode drop between the battery and 3.3v is the problem. I'm going to try a lower voltage drop Schottky to see if that fixes it... ( I am using 1000mAh Lithium - https://www.amazon.co.uk/gp/product/B07CYMYMS9). Don't pick this board if you want to use a Lithium-type battery as in practice you'll have problems with reduced useful battery life, and even worse, left on charge it will discharge below the switch on minimum voltage whilst it's left connected to its charger.I had some problems finding all the right libraries. I used U8g2 for the display, the correct instantiation for this display was:#define SCL 15#define SDA 4#define RESET 16U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ RESET);If you want to save stuff on the EEPROM you need to use the preferences library (std arduino stuff didn't work for me).UPDATE:Managed to improve the battery functionality quite a bit but to do so I had to solder a 1N5817 Schottky diode across the existing 1N5819 in the corner of the board and add a 330uF capacitor to the 3.3V rail to reduce the current spikes that were making this particularly problematic.

This a nice little ESP32 module with a builtin 0.96" 128x64 Oled display, which makes it very convenient to use.The U8G2 Arduino library works well, and I find it easier to use than the Adafruit library, once you establish the correct constructor for the SSD1306. The one that worked for me was:U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ 16, /* clock=*/ 15, /* data=*/ 4);There appears to be some confusion about the pinout, and another reviewer mentioned that it was different to the Heltec Wifi Kit 32, which varies from the pinout shown in the Amazon item description, but on the module I received, it was the same as the Heltec. Unfortunately the pin description is printed on the bottom of the board so is not visible when the module is plugged into a breadboard. Although the item description indicates that side pin stickers were provided, I did not receive them with my order, which caused me some anx!I am attaching a photo showing the bottom of the board, which shows pin 21 on the bottom left hand corner, but of course this is on the bottom right hand corner when viewed from the top! This being the case, for my module I believe that the correct pinout is as shown my photo, and not as shown the item description!For these reasons, I am afraid that I can only give it a 4* rating

Quick delivery, worked out of the box.If you need documentation ask the seller, as otherwise it's a bit of a struggle to find useful material online.See the github webpage for Heltec kit 32 (Heltec-Aaron-Lee/WiFi_Kit_series) for a useful selection of programs.OLED display works well with U8g2 library. WIFI also working well; haven't tried Bluetooth yet.In short, this is a good product and good customer service.