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add fan connection setup and explanation

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Phani Pavan K
2024-11-23 11:58:30 +05:30
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1_Basic_GPIO/digitalOut.md
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@@ -160,9 +160,10 @@ This example uses `gpio_get_out_level` to to get the output level for gicen give
sleep_ms(500); sleep_ms(500);
``` ```
---
## ParallelBlinky ## ParallelBlinky
use gpio_put_masked and gpio_set_dir_masked, set_dir_in_masked and set_dir_out_masked
In this example, the init and set dir operations are performed simultaneously using `gpio_init_mask` and `gpio_set_dir_masked` calls. These take a integer value called mask, where each bit represents one GPIO pin. The above example can be simplified and replicated with the code below. In this example, the init and set dir operations are performed simultaneously using `gpio_init_mask` and `gpio_set_dir_masked` calls. These take a integer value called mask, where each bit represents one GPIO pin. The above example can be simplified and replicated with the code below.
```c ```c
@@ -193,9 +194,33 @@ Here, the `pinMask` variable represents the gpio pins. The position from the rig
For this example, the init mask functions will initialize GP11 to GP15, because they are highlighted by `pinMask`. The set dir mask function will focus on GP11 to GP15, because they are highlighted by `pinMask`, take the bits in highlighted locations from `dirMask` and set the direction if they are 1 or 0. For this example, the init mask functions will initialize GP11 to GP15, because they are highlighted by `pinMask`. The set dir mask function will focus on GP11 to GP15, because they are highlighted by `pinMask`, take the bits in highlighted locations from `dirMask` and set the direction if they are 1 or 0.
---
## Line Control ## Line Control
This experiment showcases how digital output pin can control a DC appliance, a fan in this case, using a particular IC. The code stays the same as `Blinky`, only the hardware changes. This example showcases real world use case for digital output. This experiment showcases how digital output pin can control a DC appliance, a fan in this case, using a particular IC. The code stays the same as `Blinky`, only the hardware changes. This example showcases real world use case for digital output.
For this example, a `IRLZ44N` MOSFET is used for controlling a 12v DC fan. A 12v voltage module is used as power source for the fan. Positive of the module is connected to the fan's positive pin. The `Gate` pin of the mosfet is connected to a GPIO pin, `Source` is connected to ground and `Drain` is connected to -ve pin of the fan. It is important to note that ALL THE GROUND MUST BE CONNECTED, forming whats knows as **Common Ground**. [Explanaion provided in Arduino Forum](https://forum.arduino.cc/t/common-ground-and-why-you-need-one/626215). The ground of the 12v module is connected to ground of the pico. For this example, a `IRLZ44N` MOSFET is used for controlling a 12v DC fan. This MOSFET acts as a switch, which can be digitally controlled using the digital out pin on the pico.
A 12v voltage module is used as power source for the fan. Positive of the module is connected to the fan's positive pin. The `Gate` pin of the mosfet is connected to a GPIO pin, `Source` is connected to ground and `Drain` is connected to -ve pin of the fan.
It is important to note that ALL THE GROUND MUST BE CONNECTED, forming whats knows as **Common Ground**. [Explanaion provided in Arduino Forum](https://forum.arduino.cc/t/common-ground-and-why-you-need-one/626215). The ground of the 12v module is connected to ground of the pico. This should result in connections like below.
<img src="https://a.l3n.co/i/LgYGpM.png" width="300">
Code to turn the fan on and off with a 2 second delay:
```c
{
stdio_init_all();
const uint FANPIN = 22;
gpio_init(FANPIN);
gpio_set_dir(FANPIN, GPIO_OUT);
while (true){
gpio_put(FANPIN, true);
sleep_ms(2000);
gpio_put(FANPIN, false);
sleep_ms(2000);
}
}
```