Once everything is tested and working we will use our programmed UsbAtiny to send the code and power the board and we will put our design to work

Image taken from automatizacionparatodos

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manufacturing motor pcb board

Below we show the steps of the construction of the pcb board for the motor control elements that in the future will work as a water pump for the irrigation of the roof of the bus stop, and thus not use the proto board for the connections, to see more in detail the process of design and manufacture of pcb boards I invite you to see it in the following link Electronic Design

Here we can see the design process at Eagle

Once our design is finished, we export it as a png image, and later we generate the G-Code with the help of Mods from the Mit

Finally we check our G-Code using the G-Code simulator website

Now we can see the finished board and then weld the electronic elements

Finally we connect our motor control module to our pcb board with the ATtiny44 controller and send the code using our FabIsp programmer, we connect our humidity sensor to the motor and perform the functional tests.

you can download Eagle file

you can download G-Code file

Arduino Code

#include //include library which implements software serial port, for comunication
SoftwareSerial mySerial(0,1);
const int LED =7;
const int MOTOR =10;
void setup() {
// put your setup code here, to run once: Here we are configuring speed of the serial port
mySerial.begin(9600); //bits per second, 9600 is standard speed
//pinMode(sensorpin,OUTPUT);
pinMode(LED,OUTPUT);
pinMode(MOTOR,OUTPUT);}
void loop() {
// put your main code here, to run repeatedly:
digitalWrite(LED, HIGH); // enciende el LED
int humidity=analogRead(2);
mySerial.print("Humidity is:");
mySerial.println(humidity);
if(humidity > 760){
mySerial.println("Sensor en suelo seco");
digitalWrite(MOTOR, HIGH);
}else if(humidity < 750){
mySerial.println("Sensor en agua");
digitalWrite(MOTOR, LOW);
} delay(2000);
}

Second try, testing a board with Atmega328p

To better understand the programming of the pcb boards, several tests were carried out, initially the arduino was used with the Attiny44 to be able to see the information sent by the sensors through the serial monitor, then they were programmed using the FabUsbAttiny programmer. Finally, the construction of the pcb board with the integrated Atmega328p was concluded

For the realization of the pcb board with the 328p we take as a reference the work that we can find in the following link ATMEGA328p-AU Bootloader

Image taken from electronoobs

Once the design of our board has been defined and all the tracks have been placed, we will generate our G code from the Eagle, for this we will go to the ULP button, pcb-gcode and accept, with this our G file will be generated

When we enter the ULP button, we can go to pcb-gcode-setup, here we can vary the parameters of: milling dimension, velocity, depth among others

For letters use the MODs as a separate file

After the manufacture of the pcb board, make a first attempt to bootloader using an arduino uno, initially it was possible to burn the board but it does not work properly, use an arduino uno, since it did not have an arduino nano at that time

Initially the bootloader was carried out by using ardiono uno and apparently successfully, but the pcb board did not work when connecting the FTDI module

Burn the bootloader on an ATmega328p

Once we have made the connections recommended by the manufacturer, we will make the following 4 connections between the pins of our chip and an arduino NANO.

Digital pin 13 of the arduino NANO to pin 17 of the SMD chip (SCK)

Digital pin 12 of the arduino NANO to pin 16 of the SMD chip (MISO)

Digital pin 11 of the arduino NANO to pin 15 of the SMD chip (MOSI)

Digital pin 10 of the arduino NANO to pin 29 of the SMD chip (CS)

	Image taken from electronoobs

At this moment we open the arduino IDE. We go to FILE -> Examples -> Arduino as ISP and open the ArduinoISP example. In tools we select the Arduino NANO board, the COM that corresponds to it and load that example program into our Arduino NANO. Now, once the Arduino ISP program has been loaded into the arduino NANO and with the previous connections made we go to Tools -> Programmer -> Arduino as ISP.

Upload codes (basic configuration)

Make sure that you change back the programmer from "Arduino as ISP" to "AVRISP mkII". Then connect the FTDI progrmmer to the UART port as below to pins RX, TX and DTR. Add a 100nF cap between DTR and reset pin of the chip. Make sure you have selected Arduino NANO as board and the COM of the FTDI programmer. Then, get your code, compile and uplaod.

Image taken from electronoobs

turning on a led by motion detection

One of the objectives of the sustainable bus stop is to save energy at night, so since there are no people using it, the lights should be off, for this we will use motion sensors to control the lights of the bus stop, to To achieve this goal we have connected a motion sensor and a led to test the led control programming

you can download the code from the following link Code turn on led

Problems

During the manufacture of the pcb board, I did not consider some thicknesses of the circuit tracks, at the time of soldering the compone broke, for this reason I had to repair these tracks as can be seen in the image, once repaired it could be save the pcb board and start your bootloader and programming

to repair the tracks, I used pieces of wire and epoxy paste

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Download Code files

Download G-code files

Download Eagle files

General Conclusion:

This week's work was quite interesting and opened the doors to new ideas and design possibilities that I had not explored before, there is a lot to learn in design tools, but expertise is not learned overnight.

Finally, you have to remember all the safety parameters to make good use of the machines, especially the laser cutter, which can be very dangerous. When it comes to cutting vinyl, it was a lot of fun to be able to make custom stickers, although the job of removing excess material is a bit stressful