vfd_driver
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vfd_driver [2016/02/01 14:55] – [pinout] kingkevin | vfd_driver [2016/02/02 13:15] – [pinout] correct AUX pin kingkevin | ||
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- #LE: enable latch on low (aka. negative LE, or NLE) | - #LE: enable latch on low (aka. negative LE, or NLE) | ||
- STR: strobe the shifted data | - STR: strobe the shifted data | ||
- | - NC: not connected | + | - AUX: connected |
{{ : | {{ : | ||
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The second VFD has 10 digits, and is a copy of the 10 digits from the main VFD (minus comma and underline). | The second VFD has 10 digits, and is a copy of the 10 digits from the main VFD (minus comma and underline). | ||
- | If you don't have the auxiliary VFD connected, the main VFD will not light up. | + | The AUX pin of CN2 is shorted to ground when the auxiliary VFD is connected. |
- | To circumvent this protection | + | You can use the AUX pin to detect if the auxiliary |
+ | You can also the use AUX pin as second ground pin (i.e. for the VPP power suply). | ||
+ | If the auxiliary VFD is not present, | ||
==== segments ==== | ==== segments ==== | ||
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| GPIO | PA4 | 6 | NLE | | | GPIO | PA4 | 6 | NLE | | ||
| GPIO | PA6 | 7 | STR | | | GPIO | PA6 | 7 | STR | | ||
- | | | | 8 | GND | | + | | | | 8 | NC | |
The VPP and GND pins to drive the VFD segments are provided using an external power supply. | The VPP and GND pins to drive the VFD segments are provided using an external power supply. | ||
I use a [[http:// | I use a [[http:// |
vfd_driver.txt · Last modified: 2024/01/07 17:49 by 127.0.0.1