Build a Smart Garden with IoT Plant Monitoring System

Monitor the sunlight and water content of your plants and get alerts when you need to act. No coding. Just drag and drop the logic.



Things used in this project

  • Bolt IoT Bolt WiFi Module
  • LDR
  • Resistor 10k ohm
  • Resistor 10k ohm
  • Soil Moisture Sensor
  • Male/Male Jumper Wires
  • Mobile Charger
  • Female Header 8 Position 1 Row (0.1")
  • Female Header 8 Position 1 Row (0.1")

Software apps and online services

  • Integromat
  • Twilio SMS Messaging API
  • Bolt IoT Bolt Cloud



NOTE: To learn more about Integromat visit help.


Twilio is a cloud communicationsplatform as a service company based in San Francisco, California. Twilio allows software developersto programmatically make and receive phone callsand send and receive text messagesusing its web serviceAPIs. Know more at

Assembling the hardware

1. Get all the required components.

2. Connect one end of the LDR to pin A0 and other with 3.3V supply of the Bolt.

3. Connect a 10k Ohm resistor between A0 and GND pins of the Bolt.

4. Now connect the soil sensor probe to it's amplifier circuit using female/female jumper wires and connect the Vcc, GND and DO (Digital Output) pins of the amplifier circuit to 3.3V, GND and pin 0 of the Bolt unit respectively using the female header connectors. Remember to connect only these 3, not the analog output of amplifier circuit.

5. Place the soil sensor probe into the plant and power up the Bolt.

NOTE: Check all the connections before powering up Bolt and for any helplook into the schematic.





Connecting Bolt to cloud

After assembling the hardware, register and connect the Bolt unit to the Bolt Cloud. Know more at registering and connecting bolt to cloud.

Building up the logic on Integromat

1. First make an account on Integromat using the link.

2. After setting up the account, create a new scenario using the 'Create a new scenario' button located on the top right corner in dashboard.. For any help follow this link.

3. In the services choose BoltIIoT and Twilio.

4. Now using the services build the required logic flow as shown in figure. For any help follow this link.



5. After building the logic now we need to enter the credentials for the services being used. i.e Bolt device ID and the API key for the BoltIoT service and SSID, Authentication token number, sender's number for the Twilio service. You can found all these at and twilio.comrespectively. Look in the images below for further help.




Also fill the required command along with the pin no. for the BoltIoT service and the required SMS along with recipient's number to be send for Twilio service.

6. Get the current time and set the upper time limit and lower time limit by using the set variable tool. Fill the variable name and variable value according to your requirement. For ex.:


{formatDate(now; ""; "Asia/Kolkata")}

This command gives the current time in 24 hour clock in decimal.

{formatDate(addHours("2016-12-08T06:00:00"; 11); ""; "Asia/Kolkata")}

This returns the upper time limit of 17.00 (in our case) in decimal.

{formatDate(addHours("2016-12-08T00:00:00"; 6); ""; "Asia/Kolkata")}

This returns the lower time limit of 6.00 (in our case) in decimal.





7. Attach resume error handler to both BoltIoT services in order to prevent Integromat from stopping the scenario automatically in case of any error. In the handler use any number that is to be assigned to the Bolt in case of error. For ex. 12345 (in case of our) as shown in the image below.


8. Apply time barrier and error filter to the router's input branch and moisture content and light intensity filter to each of the router's output branch as shown below.







9. For Twilio service use your SSID, authentication key and sender's number provided on the Twilio dashboard. If you don't have Twilio account please go through this link and make one.

10. After successfully creating the logic, run to check for any errors.

11. Finally schedule your scenario according to your requirements and save it. In our case the scenario will run after every 30 minutes.



IoT Bolt IoT