‘ LED is flashed with 1 second intervals.Īn LED is connected to one of the port pins of a PIC microcontroller. Main program starts with label AGAIN where the port pin is turned on and off with 1s intervals. Port direction register TRISB is then cleared so that all PORTB pins are outputs. At the beginning of the program LED is defined as bit 0 of PORTB (PORTB.0). The software for PicBasic Pro language is shown in Figure 5.5. ‘ Led is flashed with 1 second intervals. ‘ This program flashes an LED connected to port RB0 of PORTB. Then after a delay of 1s (PAUSE 1000) the LED is turned off and this process is repeated forever. Inside the main program the LED is turned on using the HIGH LED instruction. The main program is an indefinite loop and starts with label AGAIN. It is recommended that the reader study the simple projects first before going to the more complex ones.Īddresses are defined. Projects in this chapter have been organised in increasing complexity. Software: Listings of the microcontroller programs for both PicBasic and PicBasic Pro languages. This is mainly the circuit diagram of the microcontroller and associated interface electronics used for the project.įlow diagram: A flow diagram is given to describe the operation of the project. Project description: A brief description of the project. All the projects described here have been constructed and tested using both the PicBasic and PicBasic Pro languages.Įach project has been described with the following sub-headings: In this chapter we shall be looking at various PIC microcontroller-based projects. I have verified with my dmm that all of the connections to the lcd and the pic are good and there are no shorts.In previous chapters we have seen the characteristics of the PIC microcontrollers and how to program these microcontrollers using the PicBasic and PicBasic Pro languages. Can anyone see where I am going wrong? Thanks! The only modifications to the code for this LCD are setting the amount of lines to 4 lines instead of 2, and using different DDRAM Addresses such as 0x00, 0x40, 0x14, 0x54 for the LCDOUT commands. The LCD backlight is lit and I have used this code for an 8x2 Optrex LCD with no problems. I have a 10K pot on VO and have it at around 4.2V. After compiling and uploading the hex file the screen stays blank. Hi I am trying to initialize a CFA2004ATMIJP 20x4 LCD using a Pic18f452 10MHz with PicBasic Pro.
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