Fun with Electronics

I'm trying out 128x64 dot matrix LCD, I'm thinking to use 128x64 LCD as remote control menu instead of 16x2 character LCD, bigger LCD is nicer 😁 and can display more text row 😉. By the way, I killed my 16x2 LCD 😡. I wanted to reduce the module total height. The I2C (PCF8574T) module is soldered to the LCD module via 16 pins and its thicker than I want. I was trying to separate the module but it was more difficult than expected. The hot air broke the LCD 😭 while the soldered pin is not even melt yet. I probably better if I use Dremel tool to mechanically cut the connection then use solder to pull the pin one by one. Conclusion get those unsolder part instead, save you the trouble, you have more flexibility where you want to put the module. Anyway, get my self 128x64 monochrome dot matrix LCD ST7567S with I2C interface. There was a sale at Shopee, I bought it for S$3.89, normal price at other shop S$5.55 😍. The 16x2 LCD is S$2.87, only about S$1 different. Objective:  Print ...

Building RC plane is not easy, choosing brushless motor is already very confusing. There are so many parameter need to consider (motor size, motor weight, propeller size, battery size, etc) 😵   In the end, I asked ChatGPT 😂, I summaries ChatGPT answer on the table below. In conclusion, to be able to fly without license, I need to built something under 250 grams. Based on the table, 2212 that I bought is suitable for 300 grams and above. I bought the wrong motor, waste money 😡, should asked ChatGPT earlier, part of learning 😑. I took measurement on components that I have in hand using kitchen scale 2212 motor = 61.21 grams 30A ESC = 25.59 grams Receiver = 30.20 grams 3x servo = 31.95 grams 2x 18650 battery = 100++ grams Total 248.95 grams excluding the airframe 😭. I ask my good friend ChatGPT to recommend RC plane design with target weight of 200 grams (keep 50 grams for margin) and the answer: Wingspan: 60-80 cm (100 grams) Motor 1806 or 2204 (15-25 grams) ESC: 10A - 20A ...