wemos d1 mini tft display supplier

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So many of my projects involve displaying data fetched from the internet, which means the majority of my projects involve connecting a display to ESP8266. I wanted to make a device that would make this as simple as possible.

Even for projects involving a sensor and a display, I found it frustrating to have to the same wiring for the displays I was using over and over again.

I recently came across the S77789 display and I was really impressed by it. A relatively high resolution display (in Arduino terms at least) with full colour makes it a really nice display to work with!

While there are some display shields for ESP8266 boards, they usually use very small screens with low resolutions. Using the SMD female header to connect the D1 mini to the shield allowed me to use the large display while keeping the overall size of the board as small as possible.

Why are there 2 rows of headers either side? 2x8 SMD headers are much stronger than 1x8 SMD headers, so I thought it would make sense to use the 2x8 ones. The space was needed for the display anyways.

Is it compatible with the ESP32 D1 Mini? No, I thought it would be better for prototyping if the second row of headers were connected to the inner row, so you could just connect dupont wires directly into the shield. The consequence of this is that ESP32 version of the D1 mini would have GPIO pins connected to each other and some even connected directly to power pins. Let me know if you have interest in a version for the ESP32!

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Feature 1.44inch diagonal LCD TFT display 128x128 resolution, 18 bits (262,144) color Driver IC:ST7735S Compatible with WEMOS D1 mini 3 connection methods Model:V1.0.0 Weight:7.7 grams Compatible audio and video device style:display device, player Dimensions (width x height):46.9 * 30 * 13mm Package includes 1 x Display module SH1.0-10P connector connection diagram:(the cable and D1 Mini board does not includes) With ESP8266 board:(the ESP8266 does not includes)

This is a 1.4 inch display for the very popular ESP D1 Mini series of boards. The 1.4" TFT display has a 128x128 pixels resolution and supports 18-bit colour (262,144). It"s easy to use and plugs directly into a D1 Mini. It has an adjustable backlight via spare ESP pin using PWM.

This board provides solid connection between Wemos D1 mini (ESP8266) and 2.4” TFT ILI9341 XPT2046 SPI Display (TJCTM24024-SPI). The main goal is to build cheap wi-fi enabled display with touch interface for use in various IoT projects. Display communicates with ESP8266 via SPI (display, touch and SD card reader). Displays interrupt is connected do D0 pin allowing for waking up ESP8266 from Deep Sleep state.

If you want to make it your self then Let’s start the tutorial, So you can make it in an easy way with an ESP8266, TFT display, and other few components.

A 80*160 pixel color display has the particular advantage that it is small: screen diagonal of 0.96 inch. This makes it attractive for use in (literally) small applications, particularly in scale models: railways, homes, cities. Attached to a ESP8266 and ESP32 microcontroller these displays can produce animations or day/night scenes, illuminated shop windows, traffic boards, advertisement panels and so forth. Here we wire a 0.96’ TFT with ST7735S controller to ESP8266 and ESP32 microcontroller boards

Model railway displays can be made more attractive by the addition of ‘live’ decoration: train station arrival/departure boards, information screens, advertisement boards, etcetera. Another type of decoration is animated shop windows. For this genre of application a miniature display can be an interesting option. All these applications have in common that any display used needs to be small, flat, economical and easy to fit, sometimes as retrofit, into the interior of plastic model structures such as model railway homes and Lego buildings. They even may be placed in structures belonging to model Christmas or Easter villages. The market supplies small monochrome displays, e.g. 0.91 inch diameter, 128*32 pixel OLED, the slightly bigger (0.96 inch), 64*128 pixel OLED, and the recently introduced 0.96’ 160*80 TFT. The OLEDS can be found in different versions (white, blue, yellow monochrome color). Very attractive is the 0.96’ TFT because it is capable of displaying 64k colors. Driven by a powerful ESP8266 or ESP32, animations can be run such as miniature billboards and advertisement boards. Static displays that change between day and night such as shop window illumination, are also among the possibilities. In this article we deal with the connectivity between a 0.96’, 160*80 pixel TFT and ESP8266 or ESP32 microcontroller boards. The TFT’s controller is a ST7735S which is perfectly supprted by Bodmer’s TFT_eSPI library.

Whilst the early ESP8266 development work was done with a configuration consisting of a breadboard with the display on it and with connections through jumper wires such assemblies perform very irregular. The 0.96′ SPI TFT responds very critically to imperfect wiring: one slightly loose jumper wire and the display won’t work. A minibench with soldered pin connectivity was therefore constructed for ESP8266 experiments, designed to support a Wemos D1 mini ESP8266 and a TFT display. The Wemos was selected here because its small footprint makes it easy to hide this microcontroller board inside buildings constructed from Lego blocks. Components of the minibench: a double-sided 60×40 mm soldering prototyping board, three 8-pin headers sockets and wires. The design, wiring scheme and the result are shown in figures 2 and 3.

Connected with an ESP32 the TFT display feels at ease. Maybe this is so because Bodmer’s TFT_eSPI library provides a User_Setup example that did not need tweaking. The display responded immediately, fast and reliable. Hardware SPI pins on the ESP32 are used for clock and data: pin 18 is connected to SCL at the display while pin 23 is connected to SDA of the display (see figure 4). The other pins breathe familiarity as well: RST of the display to D4 of the Wemos, DC to D2 and CS to pin D6. The pin on the display marked BLK remains unconnected; I noted comments on several fora that BLK may be connected to the 3.3V pin, to any pin on the ESP32 that supports pulse width modulation, or that the BLK pin can be set HIGH (backlight ON) or LOW (backlight OFF). The display at hand has no voltage regulator which implies that if one wants to use it with an Arduino Uno the precaution must be followed that control signals to the display run via voltage level conversion.

There are two major libraries supporting ST7735 controller-based TFTs: the Adafruit_GFX.h library and Bodmer’s TFT_eSPI.h library. My experience with the Adafruit_GFX.h library is that although the common graphic functions perform well, support of animations via a series of instructions ‘drawBitmap ()’ is relatively slow. Adafruit_GFX seems to be created for 160*128 displays. The library does not support the instruction ‘pushImage ()’. By contrast the TFT_eSPI.h library supports graphics as good as the GFX library while animations perform perfectly and at high speed, both with ‘drawBitmap ()’ and ‘pushImage ()’ functions. We further discuss here the TFT_eSPI library and keep Adafruit_GFX.h in storage for future experiments.

The TFT_eSPI library is different from most libraries, e.g. Adafruit_GFX and U8G2 in the sense that the ‘constructor’ is inside a special file whose name is ‘Setup_xxxx.h’ that resides in the folder ‘User_setups’. These special files are ascii which makes them endlessly tweakable with a common ascii text editor. The specific Setup_xxxx.h is called in another setup file named User_Setup_Select.h that resides in the library’s main directory. Consider Bodmer’s ‘constructor’ systematics as a kind of two-stage rocket. Both stages need to be edited befor launch. The first stage is User_Setup_Select.h and the second stage is Setup_xxxx.h. After the editing has been done successfully the display will indeed perform ‘as a rocket’!

The display was with both platforms tested with graphical tests that are available for everyone in the Arduino IDE through File → Examples, while I also ran several of my own graphical tests as well that I created c-arrays of pictures and displayed these supported by the TFT_eSPI.h library. I recommend here to upload example TFT_Meter_5 available in the TFT_eSPI library ensemble (in the Arduino IDE: File → Examples → TFT_eSPI → 160×128 → TFT_Meter_5). Brilliant!

Below follows the complete listing of ‘Setup_FW_ESP8266_ST7735_TFT_017.h’. For intimi: this is a modified Setup43_ST7735.h. I post here a screen capture because the WordPress editor has problems with the character ‘#’.

One way to demonstrate what one can do with a small display that runs animations is to make it part of a building, let’s say a shop window or something similar. Fortunately the 0.96′ display nicely fits in portrait orientation a front door in the Lego plastic building block system. So I scooped up some material from my children’s Lego assortment and constructed a Swiss chalet that features in the front door the 160*80 TFT display. This display is powered by an ESP32WROOM32. The rooms were fitted with white leds that can be switched on and off. Switching is controlled by an Arduino Nano and is completely separate from all the action happening at the front door. For the purpose of preparing Figure 5 I replaced the animation by a static 160*80 Panda bear image – “there’s a bear at the front door, mama!”.

I really like this kit! At first, I was a little put off at the cost. But after researching the parts, I realized that if obtained domestically in the US, they add up to just under the cost of this kit. And that is without the Wemos interface board. Sure, you could get the parts from overseas and pay a bit less and get them in 30 days or more, but I wanted to play with this tech now and Amazon Prime got it to me within a couple of days.

The kit also includes some hardware that gives you mounting options. After “dry” assembling a few configurations, I decided that I wanted to keep the SD card mount which also allowed me to use the female socket headers to insert the display into. Being a guy that likes to prototype, I wanted the clean option of removing the display easily to use with beefier hardware with more I/O. The ESP32 perhaps. Hmm. There are two spacers and 4 screws included for this option. I would have preferred four spacers and 8 screws so I could solidly mount the interface board with the display. I had more on my bench so no worries. Also included is a nice set of headers to accommodate other options. I was impressed!

The interface board is solid and took to soldering well. The mounting holes were a perfect fit to the display and that was an awesome plus! My only complaint would be that there should be some additional printing on the board indicating what the first display pin would be. Not all the pin descriptions, just the first pin. This way, the end-user knows that the board is oriented correctly and not flipped upside down. I had to do a bit of research to determine my dry-run layout was correct. And the seller was awesome in quickly addressing a question of mine by linking a site showing the connections. Two thumbs up!!

The Wemos is a fully functional D1 Mini Pro and has 16mb! That gives you tons of creative room for enhancements! I planned to rewrite everything to meet the needs of my project, that needed a touch screen and to be wifi connected so I was pleased with the processing power. If I had a complaint, it would be that the only pins left after interfacing with the TFT, is the serial pins, an analog pin (A0), and a digital pin (D0). That does not leave much room for expansion to sensors, etc. Not a design flaw though, just a limitation and workable. So long as I can attach an interrupt to D0 status change, I’m good. I have not tested that yet.

Additionally, with the sketch, the settings.h file was very convenient! The whole project is pretty well written. With MY version (remember that it might not be the latest and a mistake in versioning on my part), the time settings were all setup for Zurich. I had to adjust them for the US and although I do not fully understand the parameter meanings with the DST library, in the end I found that changing the GMT adjustment was what finally allowed the time to be displayed on my device as it is on my computer. And right down to the second too. NICE!! It is also important to note, and the settings.h file recommends this in the comments... TEST YOUR WUNDERGROUND API KEY on a browser, to see what the JSON has to offer. This is critical and proved to be a major stumbling block for me as I omitted that step. It turned out that the city I was setting in the variable did not have “_” (no quotes) for spaces between words, as in “SAN_TAN_VALLEY” for “San Tan Valley”. And finally, change the country code to the STATE abbreviation. I had to change what I set “US” to “AZ”, the state in the US where I live. After I did this and updated, the display lit up with all my weather data as expected. If you do not have these set correctly, you will get question marks in your weather data. Maybe I will write a validation function that fixes that.

I cannot speak for the seller, but I do not believe this kit was meant to be a 100% out of the box working project for weather. Rather, it is a fully functional Wemos ESP8266 controlled touch TFT display. And for that, it does it very well, with smart components selected! And at a very reasonable price! I am very impressed and happy with this purchase!! I just scratched the surface on what is possible with this gear through my sketches or modifications and it is a great building base for that geek that envisions touch control panels and wireless connectivity for all their embedded projects. INVENT! ENJOY!

I"m trying to write a sketch to use a Wemos D1 mini connected to several shields including a LOLIN TFT & I2C Connector Shield (v1.1.0). This powers a small ePaper display (LOLIN 2.13" diagonal ePaper/eInk display) with a TFT e-Paper Cable.

The problem I"m running into is that I can"t get the board to either boot properly or get out of deepSleep due to the pin assignment of the TFT display.