Pages: [1]   Go Down
Author Topic: MAN71A 7 segment, please help.  (Read 1018 times)
0 Members and 1 Guest are viewing this topic.
Norway
Offline Offline
Jr. Member
**
Karma: 0
Posts: 79
<3 Arduino
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

I'm a bit confused here, maybe someone here can help me understand this?

http://www.datasheetcatalog.org/datasheet/QT/MAN71A.pdf



From what I can understand it got a common Anode, and anode is + yes?

5V should be connected to the Common Anodes right? But how do I then control what led to light up?

And how do the pin-numbers work, 1-14?
1-7 is from top-left - bottom-left, and 8-14 from bottom-right - top-right?

Please do help me understand this  smiley
Logged

I'm from Norway!

Connecticut, US
Offline Offline
Edison Member
*
Karma: 2
Posts: 1036
Whatduino
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Supply +VDC to the anode of a given digit.

Hang a resistor below each segment's cathode of the given digit.

Below the resistor, attach control signals (digital outputs).  If you want the segment to light up, write a LOW on that signal.  If you want the segment to turn off, write a HIGH on that signal, which creates a situation where there is no voltage across the segment, and therefore no current through it.
Logged

Rural Arizona
Offline Offline
Edison Member
*
Karma: 7
Posts: 1711
Incorrigible tinkerer
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Yes,  you're right about connecting the anodes to +5,  and about the pin umbering.

To light up a segment,  connect it to a digital pin through a resistor in the range of about 180-220 Ohms (assuming I remember correctly that those old Monsanto displays have 1.7V LEDs).

Make sure the pin is set as an OUTPUT in your setup() function.

When you write a LOW to the pin,  the LED will turn on.

Ran
Logged

Pages: [1]   Go Up
Jump to: