Emilio Ricciardelli
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Tools, APP Software Used etc.
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EagleAutodesk
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Description
BT Smartphone detector
A simple USB device which when energized detects your Smartphone. If not detected, beeps. Used as a reminder in my car as I often forget the phone at home or at the office ;)
Code
Arduino code for ATTINY85 chip
C/C++
/*
1 (PB5) - - (Vcc) 8
2 (PB3) - - (PB2) 7
3 (PB4) - - (PB1) 6
4 (GND) - - (PB0) 5
PB5 -> 10
PB0 -> 11
PB1 -> 12
PB2 -> 13
REV. 2-7-2019
*/
#include <avr/sleep.h> // Sleep Modes
#include <avr/power.h> // Power management
//#include <SoftwareSerial.h>
//SoftwareSerial Monitor(5, 4);
#define POWER 3 //pin 2 - used to turn-on the BT module
#define BUZZER 1 //pin 6
#define PULSE_IN 2 //pin 7
int duration = 0;
void setup() {
pinMode(BUZZER, OUTPUT);
pinMode(POWER, OUTPUT);
pinMode(PULSE_IN, INPUT);
// used for serial
/* pinMode(0, OUTPUT);
pinMode(4, OUTPUT); // --> TX
pinMode(5, INPUT); // --> RX
Monitor.begin(9600);
*/
digitalWrite(POWER, HIGH);
digitalWrite (BUZZER, HIGH);
//wait fot BT to come up
delay(20000);
}
void loop() {
duration = pulseIn(PULSE_IN, LOW) / 100;
if (duration > 0) {
for (int i = 0; i < 30; i++) {
beep(500, 100);
}
//turn off BT
digitalWrite(POWER, LOW);
pinMode(POWER, INPUT);
sleep();
}
else {
//turn off BT
digitalWrite(POWER, LOW);
pinMode(POWER, INPUT);
sleep();
}
}
void beep(unsigned char delay_ms, unsigned char duration) {
analogWrite(BUZZER, duration); // Almost any value can be used except 0 and 255
// experiment to get the best tone
delay(delay_ms); // wait for a delay ms
analogWrite(BUZZER, 0); // 0 turns it off
delay(delay_ms); // wait for a delay ms
}
void sleep() {
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
ADCSRA = 0; // ADC off
power_all_disable();
sleep_enable();
sleep_cpu(); // sleep
}
Schematic and Layout
Diagrams
BluetoothUSB.sch
Nov 02,2021
632 views
BT Smartphone detector
A circuit to detect the absence of a Smartphone. Will beep when plugged in and your Smartphone (or whatever BT device) it's not in range.
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Published: Nov 02,2021
BOM(Bill of materials)
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