11. Project 6: Automatic Humidity Control

Level:

11.1. Part List:

1. Humidity Sensor X1 (Placed on the Multiple Sensors)

2. Humidifier X1

3. Multiple Sensors for micro:bit X1

4. Multiple Actuators for micro:bit X1

5. Connecting Wire

6. micro:bit X1

7. USB Cable X2

8. A bottle of water X1

11.2. Description:

In project 6, you can learn how to increase humidity level by a humidity sensor.

11.3. Steps:

1. Basic (Add block on start) > Plant (Add block Initialize Smarthon multiple-sensor)

2. Basic (Add block forever) > Logic (Add block if…then…else, add 1 more if…then…else, delete else) > For 1st if : Logic (Add block 0 = 0, change “0” to Plant “Get humidity”; “=” to “<”; “0” to “50” )

3. For then: Plant-More (Add block Set Humidifier to intensity 0, change “0” to “1023” ) > Basic (Add block show leds)

4. For else if: Logic (Add block 0 = 0, change “0” to Plant “Get humidity”; “=” to “>”; “0” to “70” )

5. For then: Plant-More (Add block Set Humidifier to intensity 0) > Basic (Add block show leds)

11.4. Hardware:

1. Connect Multiple Sensors and Multiple Actuators by connecting wire

2. Connect Humidifier module and USB Cable

3. Connect Humidifier & USB Cable to Humidifier (D4/P15) port of Multiple Actuators

4. Download the code and transfer to micro:bit

5. Plug the micro:bit into Multiple Sensors

11.5. Experiment:

• Does humidifier affect plant transpiration rates?

• Does humidity level affect plant height?

• Does humidifier extend plant life during low soil moisture level?