Thumbwheel switch - Electronic Circuits Projects Diagrams Free

Tuck3rz · 6th November 2009, 03:08 AM

Hi... Can i know what is a Thumbwheel switch for?
And if so, how do you read the pin configuration

DirtyLude · 6th November 2009, 03:17 AM

It's usually used for scrolling navigation in handheld devices. You can figure out the pins by reading the datasheet or simply using a multimeter to find out what they do when you operate it.

PatM · 6th November 2009, 03:26 AM

BCD Thumbwheel Switch is used to input-set data in digital form, this can be read by digital circuits, uC and uP systems and PLC-SCADA Interfaces.

alhoop · 6th November 2009, 04:05 AM

I use two thumbwheel switches to select stall/service tracks for a model railroad roundhouse and turntable. Here is how to read the two switches using a PicAxe controller with the switch commons tied to + voltage.

cnt1 = pins & $0F
cnt1 = pin4 * 10 + cnt1
cnt1 = pin5 * 20 + cnt1

If the switch commons are grounded and b0 can be used
then use the following:

b0 = pins ^ $3F
cnt1 = b0 & $0F
cnt1 = bit4 * 10 + cnt1
cnt1 = bit5 * 20 + cnt1

cnt1 is the decimal value of the two switches.

Al

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6th November 2009, 03:08 AM	#1
Tuck3rz	Thumbwheel switch Hi... Can i know what is a Thumbwheel switch for? And if so, how do you read the pin configuration

6th November 2009, 03:17 AM	#2
DirtyLude	It's usually used for scrolling navigation in handheld devices. You can figure out the pins by reading the datasheet or simply using a multimeter to find out what they do when you operate it. __________________ Mark Higgins

6th November 2009, 03:26 AM	#3
PatM	BCD Thumbwheel Switch is used to input-set data in digital form, this can be read by digital circuits, uC and uP systems and PLC-SCADA Interfaces. __________________ http://malfam.googlepages.com/

6th November 2009, 04:05 AM	#4
alhoop	I use two thumbwheel switches to select stall/service tracks for a model railroad roundhouse and turntable. Here is how to read the two switches using a PicAxe controller with the switch commons tied to + voltage. cnt1 = pins & $0F cnt1 = pin4 * 10 + cnt1 cnt1 = pin5 * 20 + cnt1 If the switch commons are grounded and b0 can be used then use the following: b0 = pins ^ $3F cnt1 = b0 & $0F cnt1 = bit4 * 10 + cnt1 cnt1 = bit5 * 20 + cnt1 cnt1 is the decimal value of the two switches. Al