Sharp GP2D12 sensor to 4x20 LCD

akakeleko

Does anyone know how I might get my LCD to Readout a distance from my Sharp GP2D12 sensor? I'd to compare the PING to the IR sensor and would really like to shoe both readouts on the LCD at the same time. the PING is easy, and I am using the Example PING code. But the GP2d12 has analog out. How can i turn that analog signal into a digital signal that my LCS can understand and then combine both the PING and the Sharp to readout at the same time. Ideally the display would look like this:

PING IR
XX Inches XX Inches

BTW, I am using the propeller demo board

Franklin

You can use RCTIME on the stamp or add an ADC chip to the mix and use the digital output. The syntax manual has RCTIME and if you go to the Parallax store and find the ADC chip there it has demo code.

John Abshier

First you need to read the analog voltage from the GP2D12. You can add an ADC chip or use counters with a resistor and capacitor (see AN001 at http://www.parallax.com/ProductInfo/Microcontrollers/PropellerGeneralInformation/PropellerMediaPage/tabid/832/Default.aspx ) Then you need to convert the analog voltage to distance. The attached Excell spreadsheet has the formulas and will calculate the required constants.

John Abshier