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Forum Index : Microcontroller and PC projects : Using the onboard led as statusled by changing the delay?
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Plasmamac Guru  Joined: 31/01/2019 Location: GermanyPosts: 554 |
Hi @matherp : is it possible to change the delaytime for the o board led to become a visual status led without extra Hardware and pin? Plasma |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6100 |
Set OPTION HEARTBEAT OFF then use pin(GP25) as a standard digital out Jim VK7JH MMedit MMBasic Help |
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| Plasmamac Guru Joined: 31/01/2019 Location: GermanyPosts: 554 |
Thx Jim , i dunno if i ever read this information mfg Plasma |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
You can have fun with that LED as it's directly connected to TP5 (the middle pad) under the Pico's PCB. If you directly connect a Red LED from TP5 to GND it automatically takes over from the green one (it has to be red as it it has a lower forward voltage than green). If you connect a 1K resistor from TP5 to the base of a NPN transistor then the transistor will turn on while the LED is lit. Useful if you are stuck for an output. This one is slightly riskier, although GP25 has some protection. If you use HEARTBEAT OFF SETPIN GP25 DIN then connect TP5 to 3V3 via a 1K resistor the LED will light and GP25 will read as 1. If you now short TP5 to GND with a contact or a turned-on NPN transistor then the LED will go out and GP25 will read as 0. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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