This is the first color, graphic LCD display I worked with. I made some assumptions when I first began working with it. From previously working with TTL logic in college, I assumed CS and RESET could just be tied high for simplicity. It wont work if you do that. They must be wired to the micro-controller to get reliable operation from the LCD. Tog
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gling them is necessary for normal operation. After wiring everything up, I desperately wanted some sign of life from the LCD, to know if it was wired correctly. Figuring out how to use the LCD without reading the datasheet is impossible. You could send random data to the display for a thousand years and never see any indication that it`s working. Towards the end of the data sheet are application notes and a nice walk through for configuring the display. Usually, after setting the contrast for it, and writing some data to the display`s ram, you`ll see it do something. Otherwise, simply powering the LCD and back-light (necessary) will give you a blue screen, and maybe just some sporadic lines from noise. Speaking of noise, this project has had the worst problems of any I`ve ever done. It`s probably been resolved by now with newer displays. Aside from using an external voltage booster for the backlight, an insulated foil ground plane could`ve been sandwiched between the display and breakout board. Scotch tape on one side of aluminum foil, the side against the board, and connect the foil to ground. void NokiaLCD::draw_text_line(word fcolor, word bcolor, byte x, byte y, char c) { lcd_set_box(x, y, x, y+7); sendCMD(RAMWR); char i; for(i=0;i<4;i+) { switch( (0x03<<(i*2) & c) >> (i*2) ){ case 0x00: sendData(bcolor >> 4) & 0xFF); sendData(bcolor & 0xF) << 4) | (bcolor >> 8) & 0xF); sendData(bcolor & 0xFF); break; case 0x01:...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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