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B4R

B4R and ESP32 MCP9808 digital temperature sensor example

by shedboy71 18th December 2017

MCP9808 digital temperature sensor example

The MCP9808 digital temperature sensor converts temperatures between -20°C and +100°C to a digital word with ±0.5°C (max.) accuracy. The MCP9808 comes with user-programmable registers that provide flexibility for temperature sensing applications. The registers allow user-selectable settings such as Shutdown or low-power modes and the specification of temperature Event and Critical output boundaries. When the temperature changes beyond the specified boundary limits, the MCP9808 outputs an Event signal. The user has the option of setting the event output signal polarity as an active-low or active-high comparator output for thermostat operation, or as temperature event interrupt output for microprocessor-based systems. The event output can also be configured as a Critical temperature output. This sensor has an industry standard 2-wire, SMBus and Standard I2C™Compatible compatible (100kHz/400kHz bus clock) serial interface, allowing up to eight sensors to be controlled in a single serial bus.
Features

Accuracy:
±0.25°C (typical) from -40°C to +125°C
±0.5°C (maximum) from -20°C to +100°C

User Selectable Measurement Resolution:
0.5°C, 0.25°C, 0.125°C, 0.0625°C

User Programmable Temperature Limits:
Temperature Window Limit
Critical Temperature Limit

User Programmable Temperature Alert Output
Operating Voltage Range: 2.7V to 5.5V

More details about the sensor at http://www.microchip.com/wwwproducts/en/MCP9808

This typically comes in a breakout such as the one in the breakout below

mcp9808 breakout

Connection

lolin32 and mcp9808

Code

You will need to install the adafruit MCP9808 library which is available at https://github.com/adafruit/Adafruit_MCP9808_Library/archive/master.zip .

[vb]

#Region Project Attributes
	#AutoFlushLogs: True
	#CheckArrayBounds: True
	#StackBufferSize: 300
#End Region

Sub Process_Globals
	'These global variables will be declared once when the application starts.
	'Public variables can be accessed from all modules.
	Public Serial1 As Serial
	Public timer1 As Timer
	Public mcptemp As Float
End Sub

Private Sub AppStart
	Serial1.Initialize(115200)
	Log("AppStart")
	RunNative("setup",Null)
	timer1.Initialize("timer1_Tick",1000)
	timer1.Enabled = True
End Sub

Private Sub Timer1_Tick
	RunNative("loop",Null)
	Log("Temperature is: ", mcptemp, "°C")
End Sub

#if C
#include <Wire.h>
#include "Adafruit_MCP9808.h"
Adafruit_MCP9808 tempSensor = Adafruit_MCP9808();
void setup(B4R::Object* o){
tempSensor.begin();
}
  
void loop (B4R::Object* o) {
 
   b4r_main::_mcptemp =tempSensor.readTempC();
}

#End if

[/vb]

Output

You should see this logged out

Temperature is: 21.2500°C
Temperature is: 21.2500°C
Temperature is: 21.2500°C
Temperature is: 21.5000°C
Temperature is: 24.3125°C
Temperature is: 25.1875°C
Temperature is: 25.5000°C
Temperature is: 25.6875°C
Temperature is: 25.8125°C
Temperature is: 25.9375°C
Temperature is: 26.0625°C
Temperature is: 26.1250°C
Temperature is: 26.1875°C
Temperature is: 26.2500°C
Temperature is: 26.4375°C
Temperature is: 26.1875°C
Temperature is: 25.1875°C
Temperature is: 24.8125°C

Links

High Accuracy Temperature Sensor MCP9808 I2C Breakout Board Module 2.7V-5V Logic Voltage

Code

A B4R ESP32 HDC1008 temperature sensor example

by shedboy71 18th December 2017

The HDC1000 is a digital humidity sensor with integrated temperature sensor that provides excellent measurement accuracy at very low power. The device measures humidity based on a novel capacitive sensor. The humidity and temperature sensors are factory calibrated.

The sensing element of the HDC1000 is placed on the bottom part of the device, which makes the HDC1000 more robust against dirt, dust, and other environmental contaminants. The HDC1000 is functional within the full –40°C to +125°C temperature range.

Key Features

Relative Humidity (RH) Operating Range 0% to 100%
14 Bit Measurement Resolution
Relative Humidity Accuracy ±3%
Temperature Accuracy ±0.2°C
Supply Voltage 3 V to 5 V
I2C Interface

Connection information

The easiest way is to purchase some sort of breakout, here is how you connect the module to your Arduino

lolin32 and hdc1008

Code

Import the Adafruit HDC 1008 libraries into the Arduino IDE as you would normally do – these are available from https://github.com/adafruit/Adafruit_HDC1000_Library

This example uses some inline c which makes the job of re-using existing libraries easy

[vb]

#Region Project Attributes
	#AutoFlushLogs: True
	#CheckArrayBounds: True
	#StackBufferSize: 300
#End Region

Sub Process_Globals
	'These global variables will be declared once when the application starts.
	'Public variables can be accessed from all modules.
	Public Serial1 As Serial
	Public timer1 As Timer
	Public hdctemp As Float
	Public hdchumi As Float
End Sub

Private Sub AppStart
	Serial1.Initialize(115200)
	Log("AppStart")
	RunNative("setup",Null)
	timer1.Initialize("timer1_Tick",1000)
	timer1.Enabled = True
End Sub

Private Sub Timer1_Tick
	RunNative("loop",Null)
	Log("Temperature is: ", hdctemp, "°C")
	Log("Humidity is: ", hdchumi, " %")
End Sub

#if C
#include <Wire.h>
#include "Adafruit_HDC1000.h"
Adafruit_HDC1000 hdc = Adafruit_HDC1000();
void setup(B4R::Object* o){
hdc.begin();
}
  
void loop (B4R::Object* o) {
  
   b4r_main::_hdchumi =hdc.readHumidity();
   b4r_main::_hdctemp =hdc.readTemperature();
}

#End if

[/vb]

Look at the log window after you compile and run, you should see this

Temperature is: 25.2185°C
Humidity is: 30.8899 %
Temperature is: 25.1581°C
Humidity is: 30.4077 %
Temperature is: 25.0977°C
Humidity is: 29.8279 %
Temperature is: 25.0574°C
Humidity is: 29.3396 %
Temperature is: 24.9969°C
Humidity is: 28.9368 %
Temperature is: 24.9466°C
Humidity is: 28.4546 %
Temperature is: 24.8761°C
Humidity is: 28.0701 %
Temperature is: 24.8459°C
Humidity is: 27.6794 %
Temperature is: 24.8157°C
Humidity is: 27.2949 %
Temperature is: 24.7653°C
Humidity is: 26.9043 %

Links

Adafruit HDC1008 Temperature & Humidity Sensor Breakout Board

Code

A look at B4R and ESP32 development

by shedboy71 18th December 2017

B4R is a development tool that I had not heard of before until today, it is from the makers of basic4Android a development tool that I have heard of.

You download the tool from https://www.b4x.com/b4r.html where they explain the requirements which are Arduino 1.8+ must be installed on your development PC, after you install B4R you setup the path to the Arduino IDE and this is so that they can use the Arduino tools that are installed for compiling and programming.

You may have guessed that this is programming in basic rather than C++ but this is not anything to do difficult to get to grips with, there are a number of tutorials and code examples on the website and also guides to help you out.

Here is my configuration

B4R config

Now connect your ESP32 board and open the board selector and choose the options required, here is my ESP32 board connected

B4R board selector

In Tools -> IDE Options -> Configure Process Timeout I changed from 60 seconds to 120 seconds as I was seeing error messages when compiling, takes quite a while for an ESP32 by the looks of it

The most obvious test is the blink led example

Sub Process_Globals
 Public Serial1 As Serial
 Private Timer1 As Timer
 Private pin5 As Pin
End Sub

Private Sub AppStart
 Serial1.Initialize(115200)
 Log("AppStart")
 pin5.Initialize(5, pin5.MODE_OUTPUT)
 Timer1.Initialize("Timer1_Tick", 1000) '1000ms = 1 second
 Timer1.Enabled = True
End Sub

Private Sub Timer1_Tick
 Dim currentState As Boolean = pin5.DigitalRead
 Log("CurrentState: ", currentState)
 Dim NewState As Boolean = Not(currentState)
 Log("NewState: ", NewState)
 pin5.DigitalWrite(NewState)
End Sub

Compile and run this and the on board LED should flash on and off

We will bringing more examples using this development tool

B4R

B4R and ESP32 MCP9808 digital temperature sensor example

A B4R ESP32 HDC1008 temperature sensor example

Key Features

Code

A look at B4R and ESP32 development

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