LCD Programming

VEX V5 General Discussion
1

Does anyone know how to program the LCD Display to get the voltages. I have this program but i need to put the secondary voltage on here because we have a battery expander.

#pragma config(UART_Usage, UART2, uartVEXLCD, baudRate19200, IOPins, None, None)
//!!Code automatically generated by ‘ROBOTC’ configuration wizard !!//

/*
Display Battery Voltage
ROBOTC on VEX 2.0 Cortex
This program uses the Display functions of ROBOTC on the VEX 2.0 Cortex platform.
It will display the value of the main battery on line 0 and backup battery on line 1.

ROBOT CONFIGURATION
MOTORS & SENSORS:

  •   			[Name]							[Type]								Description

UART Port 2 none VEX LCD VEX LCD Screen
*/

task main()
{
bLCDBacklight = true; // Turn on LCD Backlight
string mainBattery, secondaryBattery;

while(true)														// An infinite loop to keep the program running until you terminate it
{
	clearLCDLine(0);											// Clear line 1 (0) of the LCD
	clearLCDLine(1);											// Clear line 2 (1) of the LCD

	//Display the Primary Robot battery voltage
	displayLCDString(0, 0, "Primary: ");
	sprintf(mainBattery, "%1.2f%c", nImmediateBatteryLevel/1000.0,'V'); //Build the value to be displayed
	displayNextLCDString(mainBattery);

	//Display the Backup battery voltage
	displayLCDString(1, 0, "Secondary: ");
	sprintf(secondaryBattery, "%1.2f%c",nImmediateBatteryLevel/1000.0, 'V');	//Build the value to be displayed
	displayNextLCDString(secondaryBattery);

	//Short delay for the LCD refresh rate
	wait1Msec(100);
}

}*

2

So in RobotC, there is no easy way to display power expander battery level. The built in function “secondarybatterylevel” references the backup battery plugged into the cortex(9V battery). Our teams programmer managed to get it to work last year, although he has now graduated and I am unable to get the code from him as he is now on his mission. I believe however that JPearman has a thread either on here, or the RobotC forums describing how he was able to do this.

3

The expander must be connected from that extra wire port on the expander to the CORTEX, and it should be considered as an analog sensor on motors and sensor setup.
Here is a code that is took directly from our Delta II program(Basically it displays when it’s below 8V):


string expanderBattery;
//* Expander Battery Displaying *//
if(SensorValue[Power]<2240){ //If Expander Battery is below 8V (2240 Value)//
	clearLCDLine(1); //Clear LCD line 1 (Bottom Line)//
	displayLCDString(1, 0, "Exp. Low: "); //Display Expander Low//
sprintf(expanderBattery, "%1.2f%c", SensorValue[Power]/280.0, 'V');    //Build the value to be displayed//
displayNextLCDString(expanderBattery); //Display the string "expanderBattery"//
}

Hopefully this helps :slight_smile:

4

Here’s the code without the extra stuff and just direct(“Power” is the name of the expander, you can change the name if needed):


string expanderBattery;
//* Expander Battery Displaying *//
	clearLCDLine(1); //Clear LCD line 1 (Bottom Line)//
	displayLCDString(1, 0, "Expander: "); //Display Expander Low//
sprintf(expanderBattery, "%1.2f%c", SensorValue[Power]/280.0, 'V');    //Build the value to be displayed//
displayNextLCDString(expanderBattery); //Display the string "expanderBattery"//
5

thanks and also do you know how to make the program for the autonomous code chooser???

6

No sadly… With me, I just had a potentiometer dial to choose autons…

7