Read data from thingspeak channel

Documentation Help Center. This example uses an analog thermistor and the built-in ADC of an ESP to read the voltage and convert it to temperature. A thermistor is a device with a resistance that is inversely proportional to temperature. The calibration data for the thermistor is stored in your channel and read by the device.

Calibration data is based on a fit to the Steinhart-Hart model. Some manufacturers provide this calibration data with the device.

You can fit the parameters yourself by measuring the resistance of the thermistor at three distinct temperatures. For more information, see Calibrate Temperature Coefficients. Enable at least two fields: one field for reading and one field for writing. Data is written to fields 1, 2, and 3. Fields 6, 7, and 8 are used to store the temperature calibration coefficients.

This image shows the Channel Settings view for a single channel setup.

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Populate the calibration fields using a web browser address bar. The folowing values of a, band c are estimates. You can start with these values, and then calibrate your thermistor as described in Calibrate Temperature Coefficients. Modify the following text with your write API key and paste it directly into the address bar of your browser. The response is the number of entries in the channel.

If the channel is newly created, the browser returns 1, 2, and 3 after you create the first, second, and third calibration fields, respectively. It is possible to use a digital interface temperature sensor with the ESP Enter ESP in the search bar and install the package. The hardware used to generate this example used the Node MCU 1. Open a new window in the Arduino IDE, and save the file.

Add the code provided here. You do not need to change the coefficients in the code because the program reads them from your channel. Once connected, the device measures the voltage across the thermistor every two minutes. It calculates the temperature based on the calibration stored in your channel, and posts the temperature to your channel.

If the set time period has elapsed, the device is read, the temperature is calculated, and the output is written to your channel. Read data from a single field on a channel with readTSData.

read data from thingspeak channel

This example uses the Steinhart-Hart model to turn the measured resistance of the thermistor into a temperature. The model has the form:. You can determine the coefficients by measuring the resistance of the thermistor at three different temperatures. You can use your device to calibrate the coefficients with this procedure.

The ADC value shown in the serial monitor is an accurate measure of the voltage, but yields an incorrect temperature before the calibration is complete.

Convert the ADC value to a resistance measurement with the following formula for thermistor resistance.Documentation Help Center. You write the temperature and humidity data into your Dew Point Measurement channel, along with the calculated dew point data. Create a Channel as your Dew Point Measurement channel. Read the humidity and temperature from the public WeatherStation channel Fields 3 and 4, and write that data to Fields 2 and 1, respectively, of your Dew Point Measurement channel.

Dew point is calculated and written to Field 3. Click New. Select the Custom template, and click Create. In the Name field, enter Dew Point Calculation. Read the latest 20 points of temperature data with timestamps and humidity data from the public Weather Station channel into variables. Convert the temperature from Fahrenheit to Celsius. Specify the constants for water vapor b and barometric pressure c.

Calculate the dew point in Celsius. Convert the result back to Fahrenheit. Write data to your Dew Point Measurement channel.

read data from thingspeak channel

This code posts all the available data in one operation and includes the correct timestamps. See the Full Code. Any errors in the code are indicated in the Output field. To see if your code ran successfully, click your Dew Point Measurement channel link in the Channel Info panel. Schedule it to read data from the weather station every 30 minutes and calculate the dew point. Choose Recurring in the Frequency field. Choose Minute in the Recurrence field.

Select 30 in the Every — minutes field. Setting up a TimeControl to write data to your channel uses available messages on your ThingSpeak account. This action can eventually exhaust available messages, which results in rejection of channel feed updates.

Make sure that the data you write to a channel does not overlap in the time domain as it causes unnecessary use of messages. This example uses the plot function to show all three data points in a single visualization.Documentation Help Center. Read data stored in a ThingSpeak channel.

Retrieve the last five minutes of data from fields 1 and 4 of a public channel, and return the data in a timetable. Read the last five minutes of data from fields 1 and 4 of a public channel, and return the data in a table. Retrieve the most recent result for all fields of a public channel, including the timestamps.

Retrieve the last five minutes of data from fields 1 and 4 of a public channel, including the timestamp and channel information. Retrieve the data from on August 9, through on August 10, for fields 1 and 4 of a public channel, including the timestamp and channel information. The channel identification number, specified as a positive integer. Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value.

Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1, ThingSpeak server limits the number of points returned to a maximum of Adjust your ranges or make multiple calls if you need more than points of data. Channel field IDs, specified as a comma-separated pair consisting of 'Fields' and numeric values of the channel field ID to retrieve data from. Example: thingSpeakRead ,'Fields',[1,3,4]. Indicator to display positional information of data from the channel, specified as a comma-separated pair consisting of 'Location' and a logical value.

Location information includes latitude, longitude, and altitude.

read data from thingspeak channel

Example: thingSpeakRead ,'Location',true. Number of days of data to extract data from, specified as a comma-separated pair consisting of 'NumDays' and a numeric value.

Number of days is measured in hour periods. The ThingSpeak server limits the number of points returned to a maximum of Adjust your number of days, or make multiple calls if you need more than points of data. Example: thingSpeakRead ,'NumDays',2. Number of minutes of data to extract data from, specified as a comma-separated pair consisting of 'NumMinutes' and a numeric value.

Read Data from Channel

Number of minutes of data to retrieve is measured from the time the command is issued. Adjust your number of minutes, or make multiple calls if you need more than points of data. Example: thingSpeakRead ,'NumMinutes',20.

Number of data points to extract, specified as a comma-separated pair consisting of 'NumPoints' and a numeric value.Documentation Help Center. Required for private channels. Optional Number of entries to retrieve. The maximum number is 8, Optional Number of hour periods before now to include in response.

The default is 1. Optional Identifier from Time Zones Reference for this request. Optional Timezone offset that results are displayed in. Use the timezone parameter for greater accuracy. Optional Get first value in this many minutes, valid values: 10, 15, 20, 30, 60,"daily".

Post Temperature Data and Read from Channel

Optional Get sum of this many minutes, valid values: 10, 15, 20, 30, 60,"daily". Optional Get average of this many minutes, valid values: 10, 15, 20, 30, 60,"daily". Optional Get median of this many minutes, valid values: 10, 15, 20, 30, 60,"daily".

The results parameter has the highest precedence.

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Using results with the parameters minmaxtimescalesumaverageor median can cause less than records to be returned. The results parameter determines the maximum number of entries to be used for a query, up to For example, consider a channel with one update per minute. A read request to that channel with the parameters?

read data from thingspeak using python Raspberry pi or arduino

To see the format for an HTTP response, click the link or copy it to your browser. Channel 9 contains information from several home environment sensors. You can read data from this public channel. The format for the response occurs at the end of the URL, before any query string parameters. Append the first parameter after a question mark?

You can use the results parameter to control the number of entries returned, which is up to Channel 9 contains information from several home environment sensors, updates once per minute. You can use the results parameter to control the number of entries returned, up to In this request, results are averaged into two responses.To read values from Thingspeak we need to upload some data in real time, to do this, I am uploading temperature and humidity data to Thingspeak using GSM.

If you are enthusiastically landed on this post, then probably you already know how to send data to Thingspeak, if not please check out the links below after you finish reading this post. A glance on how I am going send data to Thingspeak:. I am going to send data to two fields: Temperature and humidity.

Below is the circuit setup what I have used, you can checkout circuit diagram and program code in the first link given above.

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Channel Settings that you need to do:. Go to your Thingspeak account and do the following setting to receive temperature and humidity data. Now you need to collect some information from your Thingspeak account to receive data from your channel, these channel information will be entered in the program code. We need to upload a program to ESP module to read data from Thingspeak; the Arduino board will receive and display the data on serial monitor.

Download the Thingspeak Library: Click here. How to upload program to ESP You need to wire-up the circuit as illustrated above and upload the given code to read data from Thingspeak. NOTE: A circuit must be uploading data to the same channel while you reading it on serial monitor. In this section we are going read data from Thingspeak using NodeMCU and see the data on the serial monitor. On successful program upload you will see this:. Now upload the code using previously given instruction for NodeMCU; on successful code upload you will be able to see the data from two fields of your channel.

This is normal it will take some time to read your channel, be patient wait for couple of minutes or so, sometimes it read right away. If this error message persist for more than 4 minutes, please disconnect the power and reconnect it after few seconds. What will happen when the uploading circuit goes offline?

How long will it take to update a new data on the receiving circuit? With a decent internet, it should not take more than 30 seconds [sender uploading data to Thingspeak and read by the receiving circuit].

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Usually it will take less than 20 seconds. If you have any questions regarding this project, feel free to say in the comments, you will get a guaranteed reply from us. We face similar issue because of wrong board selection. This could be the reason why the IDE did not take the mentioned header file.

The next issue you may face is not able to upload to the board. Hi, How to get data from Thingspeak in float value numbers with a decimal? What the function of constanta? Can i change the constanta to other number? Hi, I try to read data from Thingspeak using your code for 2 different channel.

Channel 1 contains 4 fields while Channel 2 contains 2 fields. However, I only manage to read data from Channel 2. Are you trying to read data from multiple channels at once? Technically that is possible. What error message are you getting? Indeed it seems you have used some other library.Login name. Remember me. Minimum search word length is 3 characters - maximum search word length is 84 characters. I'm trying to read data from an existing channel on Thingspeak using a Python Code running on a Raspberry Pi in order to automate some devices connected to the Pi but I'm having problems finding the proper library and function that facilitates these readings.

CheerLights is a project where devices read data from the ThingSpeak channel That might point you in the right direction. Basic example using standard python libraries, fetching last update from a given channel. I'm using Python 2. Wrap the above code in a loop that continually re-reads the data after a delay at least 15 seconds, possibly more depending on your data. If you have an internet-accessible device set it up as a HTTP server and set up a thingspeak react to push the data out to your device.

This will obviously require much different code to the above. Currently Online: 21 Guest s. Currently Browsing this Page: 1 Guest s. Moderators: cstapels: Administrators: Hans:lee: Please consider registering Guest.

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Login name Password Remember me Register Lost password? How to read data from a Thingspeak channel using a Raspberry Pi.

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March 28, pm. Member Since: March 18, Hello, I'm trying to read data from an existing channel on Thingspeak using a Python Code running on a Raspberry Pi in order to automate some devices connected to the Pi but I'm having problems finding the proper library and function that facilitates these readings. Help anyone? Member Since: January 18, Also, this library looks to be API complete. You can read and write to ThingSpeak channels.

What version of Python are you using? Member Since: January 30, April 3, pm. Much much gratitude. June 7, am. New Member. Member Since: June 7, June 9, am.Documentation Help Center. You can use the MQTT subscribe method to receive messages whenever the channel is updated. Prototyping with Sonar Proximity Sensor. Post Temperature Data and Read from Channel. ThingSpeak Support Toolbox. Read Cheerlights Channel with Arduino. Time Zones Reference. Use a Particle Photon board to subscribe to channel updates from the CheerLights channel.

The program reads a color from the channel and displays it using on the built-in LED on the Photon board. You can subscribe to the channel feed or directly to the color field on the CheerLights channel as shown in this example. You read a soil moisture sensor and post the value to a ThingSpeak channel. The ESP32 records and posts the signal strength of the wireless network that it is connected to.

Press a button on the board to take three measurements of the wireless network signal strength and post the average result to a ThingSpeak channel.

The device also posts a counter value so you can track measurements. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:. Select the China site in Chinese or English for best site performance. Other MathWorks country sites are not optimized for visits from your location. Toggle Main Navigation. Search Support Support MathWorks.

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How to read data from a Thingspeak channel using a Raspberry Pi | Raspberry Pi | Forum

Select a Web Site Choose a web site to get translated content where available and see local events and offers. Select web site. Read Status. Read Last Entry. Read Last Field Entry. Read Last Status. Read Last Entry Age. Read Last Field Entry Age. Subscribe to a Channel Feed. Subscribe to a Channel Field Feed. Read data stored in a ThingSpeak channel.

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