# Bitcoin Price Clock
**URL:** https://community.particle.io/t/bitcoin-price-clock/26541
**Category:** Project Share
**Created:** [October 15, 2016, 12:51am UTC](https://community.particle.io/t/bitcoin-price-clock/26541 "2016-10-15T00:51:18Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@nrobinson2000](https://community.particle.io/u/nrobinson2000)
#### Post date: [October 15, 2016, 12:51am UTC](https://community.particle.io/t/bitcoin-price-clock/26541/1 "2016-10-15T00:51:18Z")
###Today I made a Bitcoin Price Clock using a Particle Photon, my new Particle Shield Shield, and a [LCD Keypad Shield](https://www.dfrobot.com/wiki/index.php/Arduino_LCD_KeyPad_Shield_%28SKU:_DFR0009%29) that I had lying around.
## Here is a picture of the clock:
## Here is the code for the Photon (the `LiquidCrystal` library is required):
```auto
#include "application.h"
#include "LiquidCrystal.h"
/ *******************************************************
Display the Bitcoin price in Dollars and the time on an LCD
Nathan Robinson, October 2016
******************************************************** /
// select the pins used on the LCD panel
LiquidCrystal lcd(A5, A4, D6, D0, D1, D7);
String getAskPrice(String data) // This function gets the value in the "ask:" part of the JSON.
{
int kLocation = data.indexOf("k"); // Find where the "k" of ask appears
int commaLocation = data.indexOf(",", kLocation); // Find where the comma after the value appears
String value = data.substring(kLocation +4, commaLocation); // The value is from 4 characters after where "k" is and right before where the comma is.
return value; // Return the ask price of Bitcoin
}
void bitcoinHandler(const char *event, const char *data) // This is called when the Photon recives the webhook data.
{
Serial.println(data); // Print the data to serial for debugging
String ask = String(getAskPrice(data)); // Get the ask price of Bitcoin
Serial.println(ask); // Print it to serial
lcd.setCursor(0, 1); // Set the cursor to the second line
lcd.print("$"); // Clear the second line
lcd.print(ask); // Print the price of bitcoin
lcd.print(" "); // Print " " after
}
void setup()
{
lcd.begin(16, 2); // start the library
lcd.setCursor(0,0);
lcd.print("Price: Time:"); // print a simple message
Particle.publish("bitcoin"); // Trigger bitcoin webhook
Particle.subscribe("hook-response/bitcoin/0", bitcoinHandler, MY_DEVICES); // Subscribe to the webhook response
Time.zone(-4);
Serial.begin(9600);
}
void loop()
{
if (millis()/1000 % 10 == 0) // Every ten seconds
{
Particle.publish("bitcoin"); // Trigger bitcoin webhook
}
lcd.setCursor(8,1); // move cursor to second line "1" and 8 spaces over
if (Time.hour() < 10)
{
lcd.print("0");
lcd.print(Time.hour());
}
else
{
lcd.print(Time.hour());
}
lcd.print(":");
if (Time.minute() < 10)
{
lcd.print("0");
lcd.print(Time.minute());
}
else
{
lcd.print(Time.minute());
}
lcd.print(":");
if (Time.second() < 10)
{
lcd.print("0");
lcd.print(Time.second());
}
else
{
lcd.print(Time.second());
}
}
```
## The Photon relies on a webhook to get data from the [Bitcoin Average API](https://api.bitcoinaverage.com/ticker/global/USD):
```auto
{
"eventName": "bitcoin",
"url": "https://api.bitcoinaverage.com/ticker/global/USD/",
"requestType": "GET",
"mydevices": true
}
```
## I hope you enjoyed my project of the day and I hope to make more random projects like this.
---
### Author:  [@Cloud](https://community.particle.io/u/Cloud)
#### Post date: [October 15, 2016, 9:34am UTC](https://community.particle.io/t/bitcoin-price-clock/26541/2 "2016-10-15T09:34:59Z")
Building this, I need a screen though, Kind of want to OLED it…BTW isn’t the shieldshield a sexy piece of kit…black solder mask, mmmmm.
---
### Author:  [@KyleG](https://community.particle.io/u/KyleG)
#### Post date: [October 15, 2016, 6:54pm UTC](https://community.particle.io/t/bitcoin-price-clock/26541/3 "2016-10-15T18:54:41Z")
Thanks for sharing this! I look forward to what you build next @nrobinson2000!
---
### Author:  [@nrobinson2000](https://community.particle.io/u/nrobinson2000)
#### Post date: [October 24, 2017, 7:36pm UTC](https://community.particle.io/t/bitcoin-price-clock/26541/4 "2017-10-24T19:36:13Z")
# UPDATE:
It’s been a year and Bitcoin is on track to increase tenfold of what it was when I first shared this.
Here is the updated webhook:
```json
{
"event": "bitcoin",
"url": "https://blockchain.info/ticker?cors=true",
"requestType": "GET",
"responseTemplate": "{{USD.last}}",
"mydevices": true
}
```
And here is the updated code for the photon:
```cpp
#include "Particle.h"
#include "LiquidCrystal/LiquidCrystal.h"
/ *******************************************************
Display the Bitcoin price in Dollars and the time on an LCD
Nathan Robinson, October 2016
Updated in October 2017, to use new API and accommodate new price
******************************************************** /
// select the pins used on the LCD panel
LiquidCrystal lcd(A5, A4, D6, D0, D1, D7);
void initLCD() {
lcd.begin(16, 2); // start the library
lcd.setCursor(0,0);
lcd.print("Price $: Time:"); // print
Time.zone(-4);
Serial.begin(9600);
}
STARTUP(initLCD());
void bitcoinHandler(const char *event, const char *data) { // This is called when the Photon recives the webhook data.
Serial.println(data); // Print the data to serial for debugging
String latest = String(data); // Get the latest price of Bitcoin
Serial.println(latest); // Print it to serial
lcd.setCursor(0, 1); // Set the cursor to the second line
lcd.print(latest); // Print the price of bitcoin
lcd.print(" "); // Print a dividing space after
}
void setup() {
Particle.publish("bitcoin"); // Trigger bitcoin webhook
Particle.subscribe("hook-response/bitcoin", bitcoinHandler, MY_DEVICES); // Subscribe to the webhook response
}
void loop() {
if (millis()/1000 % 10 == 0) // Every ten seconds
{
Particle.publish("bitcoin"); // Trigger bitcoin webhook
}
// Print the time
lcd.setCursor(8,1); // move cursor to second line "1" and 8 spaces over
if (Time.hour() < 10) {
lcd.print("0");
lcd.print(Time.hour());
}
else {
lcd.print(Time.hour());
}
lcd.print(":");
if (Time.minute() < 10) {
lcd.print("0");
lcd.print(Time.minute());
}
else {
lcd.print(Time.minute());
}
lcd.print(":");
if (Time.second() < 10) {
lcd.print("0");
lcd.print(Time.second());
}
else {
lcd.print(Time.second());
}
}
```