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Lire les données du canal

Utilisez les API REST et MQTT pour lire les chaînes à l'aide de logiciels ou d'appareils

ThingSpeak™ est une plateforme IoT qui utilise des canaux pour stocker les données envoyées à partir d'applications ou d'appareils. Vous pouvez lire les données de vos canaux ThingSpeak à l'aide des appels HTTP et de l'API REST. Vous pouvez utiliser la méthode d'abonnement MQTT pour recevoir des messages chaque fois que la canal est mise à jour. Et vous pouvez utiliser thingSpeakRead pour lire les données de votre canal dans MATLAB de bureau. En savoir plus sur le moment auquel Choose Between REST API and MQTT API pour mettre à jour une canal.

API REST

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Lire les données

`Read Data`	Read data from all fields in channel with HTTP GET
`Read Field`	Read data from single field of channel with HTTP GET
`Read Status`	Read status field of channel with HTTP GET
`Read Last Entry`	Read last entry in channel with HTTP GET
`Read Last Field Entry`	Read last entry in channel field with HTTP GET
`Read Last Status`	Read last status of channel with HTTP GET

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`Read Last Entry Age`	Read number of seconds since last entry in channel with HTTP GET
`Read Last Field Entry Age`	Read number of seconds since last entry in field with HTTP GET

API MQTT

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Abonnez-vous aux mises à jour de la chaîne avec l'API MQTT

`Subscribe to a Channel Feed`	Subscribe to updates from channel feed with MQTT
`Subscribe to a Channel Field Feed`	Subscribe to channel updates from specific field of channel with MQTT

Fonctions

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Lire les données avec MATLAB

thingSpeakRead Read data stored in ThingSpeak channel (depuis R2019a)

Rubriques

Choisissez comment lire les données

Choose Between REST API and MQTT API
Learn when to use REST and MQTT to update a channel.
Publish and Subscribe to a Channel Using Desktop MQTT Client
This example shows how to use a desktop MQTT client to publish and subcribe to a channel.

Lire des données avec Arduino ou Particle Photon

Prototyping with Sonar Proximity Sensor
This example shows how to prototype with ThingSpeak™ using a Wi-Fi connected Arduino® board.

Lire les données avec ESP8266

Post Temperature Data and Read from Channel
This example shows how to collect environmental data from a device and post it from your device to a ThingSpeak™ channel.
Moisture Sensor using HTTP POST Requests to Channel
This example shows how to post multiple fields of data to a ThingSpeak™ channel from a device that wakes from deep sleep.
Bulk-Update Using an Arduino or an ESP8266
This example shows how to use either an Arduino® MKR1000 board or an ESP8266 board connected to a Wi-Fi® network to continuously collect Wi-Fi signal strength and bulk-update a ThingSpeak™ channel.

Lire des données avec ESP32

Wireless Network Signal Strength with ESP32 with Arduino IDE
This example shows how to use the wireless network functionality of ESP32 to post data to ThingSpeak™.

Informations connexes

Résolution des problèmes

Error Codes

See the details of ThingSpeak REST API error messages and corresponding HTTP status codes.

Troubleshoot MQTT Subscribe

Common mistakes and problem resolution for subscribing to ThingSpeak.

Exemples présentés

Use Particle Photon Client to Subscribe to Channel Updates

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.

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Post Temperature Data and Read from Channel

Collect environmental data from a device and post it from your device to a ThingSpeak™ channel. The example uses an ESP8266 and the ThingSpeak Communication Library to post data and retrieve data from a channel.

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Moisture Sensor using HTTP POST Requests to Channel

Post multiple fields of data to a ThingSpeak™ channel from a device that wakes from deep sleep. You read a soil moisture sensor and post the value to a ThingSpeak channel. The HTTP POST request is executed by writing to a communication client without a separate library. Directly writing the HTTP request to the wireless network client can offer increased flexibility and speed over the ThingSpeak Communication Library.

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Wireless Network Signal Strength with ESP32 with Arduino IDE

Use the wireless network functionality of ESP32 to post data to ThingSpeak™. 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.

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