Membuat nge-Pot 85 (Open Hardware, Open Source)

Kalau kemarin membahas pengalaman mendesain & membuat nge-Pot 85 (Pot Elektronik), kini tibalah saatnya saya membagikan detail rangkaiannya. Namun mohon maaf, saya belum merapikan skema-nya dan tidak menyertakannya. Sekedar untuk diketahui, saya memulai desain justru dari layout PCB. Sedangkan layout breadboard dan skema otomatis tergambar di Fritzing. Hanya saja bertumpukan sehingga perlu dirapikan lagi tampilannya.

Layout PCB nge-Pot 85 tampak atas

Di atas adalah tampilan atas dari PCB nge-Pot 85. Jika ingin membuat PCB sendiri, silakan download layout untuk etsa (etch) di sini: PCB copper bottom. Sedangkan di bawah ini daftar komponennya ditampilkan dalam 2 daftar, yaitu dalam format penamaan utk perakitan dan daftar belanjaan. Oh iya, jangan lupa menambahkan socket untuk ATtiny85 dan header female untuk titik-titik pengukuran.

Revisi 04/10/2012: Maaf saya salah menuliskan nilai resistor. Daftar di bawah sudah saya perbaiki.

Assembly List

Label	Part Type	Properties
7805	Voltage Regulator – 5V	package TO220 [THT]; voltage 5V
AC	Screw terminal – 2 pins	package THT; hole size 1.0mm,0.508mm; pins 2; pin spacing 0.137in (3.5mm)
Atas	Trimmer Potentiometer	package THT; size Trimmer – 6mm; track Linear; type Trimmer Potentiometer; maximum resistance 10kΩ
Bawah	Trimmer Potentiometer	package THT; size Trimmer – 6mm; track Linear; type Trimmer Potentiometer; maximum resistance 10kΩ
C1	Electrolytic Capacitor	package 100 mil [THT, electrolytic]; capacitance 10µF; voltage 6.3V
C2	Tantalum Capacitor	package 100 mil [THT, tantalum]; capacitance 0.1µF; voltage 6.3V
C3	Electrolytic Capacitor	package 100 mil [THT, electrolytic]; capacitance 10µF; voltage 6.3V
D1	Rectifier Diode	package 300 mil [THT]; type Rectifier; part # 1N4001
DC	Power plug
J1	Generic rounded female header – 4 pins	package THT; hole size 1.0mm,0.508mm; row single; form ♀ (female rounded); pins 4; pin spacing 0.1in (2.54mm)
J2	Generic female header – 2 pins	package THT; hole size 1.0mm,0.508mm; row single; form ♀ (female); pins 2; pin spacing 0.1in (2.54mm)
LED1	Red LED – 5mm	package 5 mm [THT]; leg yes; color Red (633nm)
LED2	Red LED – 5mm	package 5 mm [THT]; leg yes; color Red (633nm)
Part1	Relay T73	voltage 5V
Q1	NPN-Transistor	package TO92 [THT]; type NPN
R1	1k Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 1kΩ; pin spacing 400 mil
R2	10k Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 10kΩ; pin spacing 400 mil
R3	220 Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 220Ω; pin spacing 400 mil
R4	220 Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 220Ω; pin spacing 400 mil
R5	22k Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 22kΩ; pin spacing 400 mil
R6	22k Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 22kΩ; pin spacing 400 mil
Soil	Mystery Part – 3 pins	package THT; hole size 1.0mm,0.508mm; layout Single Row; true; label ?; pins 3; pin spacing 100mil
Tiny85	DIP – 8 pins	package DIP (Dual Inline) [THT]; hole size 1.0mm,0.508mm; true; chip label IC; pins 8; pin spacing 300mil

Shopping List

Amount	Part Type	Properties
1	Power plug
2	Electrolytic Capacitor	package 100 mil [THT, electrolytic]; capacitance 10µF; voltage 6.3V
1	Tantalum Capacitor	package 100 mil [THT, tantalum]; capacitance 0.1µF; voltage 6.3V
1	Rectifier Diode	package 300 mil [THT]; type Rectifier; part # 1N4001
2	Red LED – 5mm	package 5 mm [THT]; leg yes; color Red (633nm)
1	DIP – 8 pins	package DIP (Dual Inline) [THT]; hole size 1.0mm,0.508mm; true; chip label IC; pins 8; pin spacing 300mil
1	Mystery Part – 3 pins	package THT; hole size 1.0mm,0.508mm; layout Single Row; true; label ?; pins 3; pin spacing 100mil
1	Screw terminal – 2 pins	package THT; hole size 1.0mm,0.508mm; pins 2; pin spacing 0.137in (3.5mm)
1	Generic rounded female header – 4 pins	package THT; hole size 1.0mm,0.508mm; row single; form ♀ (female rounded); pins 4; pin spacing 0.1in (2.54mm)
1	Generic female header – 2 pins	package THT; hole size 1.0mm,0.508mm; row single; form ♀ (female); pins 2; pin spacing 0.1in (2.54mm)
2	Trimmer Potentiometer	package THT; size Trimmer – 6mm; track Linear; type Trimmer Potentiometer; maximum resistance 10kΩ
1	10k Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 10kΩ; pin spacing 400 mil
1	1k Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 1kΩ; pin spacing 400 mil
2	220 Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 220Ω; pin spacing 400 mil
2	22k Ω Resistor	package THT; tolerance ±5%; bands 4; resistance 22kΩ; pin spacing 400 mil
1	Voltage Regulator – 5V	package TO220 [THT]; voltage 5V
1	NPN-Transistor	package TO92 [THT]; type NPN
1	Relay T73	voltage 5V

Di bawah ini adalah source code-nya. Seperti yang sudah-sudah, proyek nge-Pot 85 ini open source dan open hardware.

/*
Project: nge-Pot 85 (Pot elektronik)
Author: Dewo, setio.dewo@gmail.com
Date started: 30/09/2012
*/

#define soil_pin 1     // sambungkan ke sensor soil moisture
#define bawah_pin 3    // referensi ambang penyalaan pompa
#define atas_pin 2     // referensi ambang mematikan pompa
#define relay_pin 1    // pin relay
#define jeda_baca 100  // jeda waktu pembacaan sensor soil

int status = LOW;      // status awal

void setup() {
  pinMode(relay_pin, OUTPUT);
  digitalWrite(relay_pin, status);
  //pinMode(soil_pin, INPUT); // disabled. nomer pin berbagi utk input analog & output relay.
  pinMode(bawah_pin, INPUT);
  pinMode(atas_pin, INPUT);
  
  /* hanya utk test upload program. Jangan diaktifkan saat ada relay.
  for (int i=0; i<=5; i++) {
    digitalWrite(relay_pin, HIGH);
    delay(50);
    digitalWrite(relay_pin, LOW);
    delay(50);
  }
  */
}

void loop() {
  baca_parameter();
  //test_baca();
}

void test_baca() {
  int soil = analogRead(soil_pin);
  if (soil <= 100) {
    digitalWrite(relay_pin, HIGH);
  }
  else digitalWrite(relay_pin, LOW);
  delay(100);
}

void baca_parameter() {
  int soil = analogRead(soil_pin);
  int bawah = analogRead(bawah_pin);
  int atas = analogRead(atas_pin);
  
  if (soil <= bawah) {
    if (status == LOW) {
      status = HIGH;
      digitalWrite(relay_pin, status);
    }
  }
  else if (soil >= atas) {
    if (status == HIGH) {
      status = LOW;
      digitalWrite(relay_pin, status);
    }
  }
  delay(jeda_baca);
}

Saya sangat berterima kasih jika ada masukan dari pembaca mengenai nge-Pot 85 ini. Salam ngoprek.

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