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how to drive graphic lcd
Thank you. and I have just updated the driver the that 2.2" TFT LCD module for PIC18. However, its full power has not been unladhed yet. It should be able for animation display. Still working on it.
John Leung
micro controller theary tutorial
Teh easiest mcu to learn is the Parallax's Basic Stamp. Look at www.parallax.com for tutorial and examples.
If you have grabbed all basic technique with BASIC STAMP, you would be "promoted" to mcu such as PIC, 8051, etc.
John
You have ready-for-use example in atmel web site for hardware SPI.
For software SPI, may consider using discrete IO pins as
#define uchar unsigned char
sbit RF_MISO = P2^3; //say
sbit RF_MOSI = P2^2;
sbit RF_SCK = P2^1;
sbit RF_CSN = P2^0;
...
void spiWr(uchar);
uchar spiRd(void);
...
4*5 buttons like a matrix keypad of RB[4:7] matrix with RD[0:4]. Take RA0,1,2,3 as the ADC input for potentiometers.
USB device for HID class. May use external USB transceiver like the one described at www.beyondlogic.org (I2C) bus interface with PIC 16F877A.
John
vusb pic
connect both the PIC's Vcc and Vusb to my external 3.3V regulator and disable the PIC's internal regulator
Yes, it is possible to do that. The other way is to enable the internal regulator and bypass the Vusb pin with 470nF capacitor. Because you are using 3.3V, there won't be 3.3V...
cheapest usb uart
There is a fully working example from Microchip included in the USBDEM board. It is the CDC example. Progamming language in C18. Run that example and plug in the USB cable would give you a COM PORTx emulated in the host (PC)
John
18lf4550
Buffer in the microcontroller side known as end-points. End-points built-in the 18F2550/4550 series. There are IN and OUT endpoints as buffer for the direction in and out for the host. For IN, it is in respect to the host (PC) meaning data flowing in the PC from the mcu. For OUT, data...
16lf877a voltage
Yes, that is my mistake. I have got confused the 18LF and 16LF series. It seems there is nothing about discrete BOR voltage for 16LF series.
John Leung
Re: 89s52 help
There are various thread in this forum about isp programmer for AT89S52/51.
Try the keywords AT89S52, ISP programmer, etc. to find out more.
John
16f877a y el 16fl877a
Under the Configuration Bits in MPLAB, it is possible to set different Brown Out Voltage at 2.0V, 2.7V, 4.2V, and 4.5V.
John Leung
www.TechToys.com.hk
Re: QUEUING SYSTEM
First define the requirement such as:
How many calling counters?
How many queue?
Is the calling preference a first come first serve basis?
How big is the display for the public required? What format? Is it to be a simple 7-segment, or dot-matrix LED display, or color LCD TV...
Suppose the floating point result is obtained from a sensor of 16-bit resolution, we may use a union to store the raw sensor result. By using a union, we store the floating point (4-bytes) in the union. The advantage is that, we save a lot for the eeprom by storing only the raw data. Consider...
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