I'm currently building a 4 fan speedcontroller for my drive bay...it will be encased in an old cd drive casing.
I want to add speed display for all fans and i thought the easiest way to do this would be to build separate voltmeters for each fan. I'd like a circuit that i can either use a 2 segment led display or a circuit that will just run a regular 10-led bargraph...in case of the bar graph the first led should be able to light at 5v and the last one at 12...does anyone know any good circuits that will work. I did find some ICL 7106/7107 based circuits but they're designed for 4 segment led displays.
I want to add speed display for all fans and i thought the easiest way to do this would be to build separate voltmeters for each fan. I'd like a circuit that i can either use a 2 segment led display or a circuit that will just run a regular 10-led bargraph...in case of the bar graph the first led should be able to light at 5v and the last one at 12...does anyone know any good circuits that will work. I did find some ICL 7106/7107 based circuits but they're designed for 4 segment led displays.
Hi,
the bar or dot graph display chip is easy to implement.
Try looking at http://www.electronics-tutorials.com/devices/lm3914.htm
BTW, Ian Purdie's (VK2TIP) site is full of good tutorials.
the bar or dot graph display chip is easy to implement.
Try looking at http://www.electronics-tutorials.com/devices/lm3914.htm
BTW, Ian Purdie's (VK2TIP) site is full of good tutorials.
I might try this one, and if i cant use it for what i need, i'll always find it some other use DIGITAL VOLTMETER
i guess i mixed the terms a bit anyway...what i meant is 2 numeric leds (i guess they're called 7 segment or something) anyway, i guess i'll try that circuit i posted the link to but leve one of the leds out, so i'll have 3 leds to show "00.0" i'll post some experiences after its done in this case the bay will have only one display
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Design & Build
- Equipment & Tools
- Looking for a LED voltmeter circuit