matrix mini clock with alarm, thermometer and hygrometer

   After some time, I update project "mini clock" with DHT sensor, schematic is now

  

  Because, I realize in original program I haven't all characters I need, I "reverse engineer"-ing  file with characters using Hexadecimal to Binary Converter to made new charactes:

So, character are vertical and from up to down. so I design my characters:

     Now, my character file has new characters 😆

   For not be problems, I remane my file as and put near original file

So, for testing, I simulate al cases:

- low humitity (< 10%)

- normal humidity 

- 2-digit negative temperature:

- 1-digit negative temperature:

- 1-digit positive temperature:

- 2-digit positive temperature:

   Using my /mini_clock_1_3 sketch, I made matrix mini clock with alarm, thermometer and hygrometer

    I use DHT22 (AM2302) sensor so sketch is

and if you have DHT11 just change to

   I use RTC with DS3231, but work without changes with DS1307 (note; DS3231 is more accurate than DS1307)....

6 Digit 7 Segment HT1621 LCD Display Module with Arduino

   I buy from Gearbest an interesting lcd display with 6 digit 7-segment drived by HT1621 chip.

  I search informations about this display and Arduino development board and I find few articles, but more usefull was article from http://www.14core.com/wiring-the-6-digit-7-segment-2-4-inch-ht1621-lcd-display-module-on-microcontroller/. I test the schematic presented in article

with HT1621_test.ino sketch and on display is 23:45 clock with animated second and after 17 degree Celsius:

This mode can be see it on HT1621 6 digit 7 segment LCD display test video

   After some search and study I can put easy decimal point, so, using HT1621_test4.ino sketch, on display is a random hour clock with animated seconds indicator (between hour and minutes)

and random temperature (negative and positive)

   In HT1621 6 digit 7 segment LCD display - test 2 video you can see this display mode:

NTP clock using OLED Wemos Lolin ESP32

   I buy an interesting ESP32 development board module because it has built-in OLED display drived with SSD1306 chip (is classc 0.96" OLED display).

  I combine 2 sketches to use NTP clock data (see https://en.wikipedia.org/wiki/Network_Time_Protocol for more info). This sketch is ESP32_OLED_SSD1306_NTP_0.ino who use ESP32-OLED0.96-ssd1306 and NTPtimeESP libraries.

   You can see how is clock displayed on OLED display while whatching NTP clock using OLED Wemis Lolin ESP32 movie.

Matrix clock with alarm

   At begin of this year I find article Mini led clock and I test using changed sketch (mini_clock_1a.ino) and schematic

   Also, I made 2 movie:
- clock on matrix led display with MAX7219

- clock on matrix led display with MAX7219 (2)

   Now, I add alarm feature, schematic is now

   Using mini_clock_1_2.ino sketch now you can see data and if alarm is activate by pushing second button (if alarm is deactivate, on screen not apear text with them).
    I made matrix mini clock with alarm movie when you can see how clock work

  

WebServer with ESP32

   I buy an Geekcreit® ESP32-DevKit development board and I want to test quickly, so I use information from article ESP32 Web Server – Arduino IDE writted by Rui Santos.

    I discover that development boar has 2 built-in leds, one at GPIO0 and one at GPIO27 (while om net is mentioned just GPIO27), so I change the sketch to use this leds and to invert logical level because leds are connected thru resistors at +3,3V not GND.
   Changed sketch is ESP32_WebServer.ino and you can upload in ESP32 development board after follow steps from article Installing the ESP32 Board in Arduino IDE (Windows instructions).
   After upload my sketch, in serial monitor it appear IP adress for local WebServer

   First, both leds are off

but after you push virtual button from webserver named GPIO0 led will lit (upper button)

and after push botton button (GPIO27) apropriate led will lit

 To have just GPIO27 led lit, must pust on GPIO0 button

   I made Web Server with red ESP32 board from Banggood movie where is presented how WebSwever control the two leds

Show Temperature and Humidity as WiFi SSID with ESP8266 and DHT22 Sensor

   I use informations from article Show Temperature and Humidity as WiFi SSID with ESP8266 and HTU21D Sensor, just change sensor. Instead HTU21D, I use DHT22 (AM2302), my schematic is

   I program NodeMCU development board (work any development board with ESP8266: Lolin, Adafruit, WeMos, etc) with Arduino IDe software, using dht_custom_ssid_exp8266_1.ino sketch.
   For frogram ESP8266 as Arduino must follow steps from เพิ่มบอร์ด ESP8266 ใน Arduino IDE (or from my article named Placa NodeMcu v.0.9 programata in Arduino IDE).
  Also, you need 3 library:
- DHT
- Pstring
- Streaming
   Now, we can find Wi-Fi network with custon name (ESP8266 is in AP mode):
- on Android phone

- on PC with Windows 7

   Name of SSID will change at every 10 seconds, but best view is in Android phone (quick change).
   I made Show Temperature and Humidity as WiFi SSID with ESP8266 and DHT22 Sensor video to see how this system work:

128x128 1.5" OLED display with SSD1327 controlled by ESP32

original article

   I received an interesting display for test (OLED technology, 128x128 resolutios, SSD1327 driver) for made to work with ESP32 development board.

   Default, connexion is for SPI, but you can change to i2c connexion, see in schematic from here.

   I search info and after few tests, I used with good results u8g2 library  and my config is

U8G2_SSD1327_MIDAS_128X128_F_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 12, /* cs=*/ 14, /* dc=*/ 27, /* reset=*/ 26);

   You can see 1.5” OLED display with ESP32 movie