Hardware Build Guide (Mac Software)

Download the USB driver so the ESP32S board can communicate with your computer. The Mac OS version can be found here.

Unzip the download and open the installer SiLabsUSBDriverDisk.dmg.

A new window will open. Click on Install CP210x VCP Driver to open the driver.

You might be asked for confirmation to open the Driver. To proceed click 'Open'.

Follow the onscreen instructions to install the USB driver.

The USB driver will let the ESP32S board communicate with your computer. You don't have to open the driver beyond this step, it will just do its thing in the background.

The Yo-Yo Firmware Uploader will enable you to upload the latest firmware to your ESP32S board. Download the latest release here.

Firmware is code the ESP32S board needs in order to work as a Yo–Yo device. It's called firmware because it is software used to configure hardware — soft + hard = firm. Geddit?

Open the downloaded app. Note that your operating system may ask you to verify the app.

You will need to give permission to open the app in System Preferences > Security & Privacy when prompted.

Security & Privacy settings may vary in different versions of MacOS. You can find more information in our FAQs.

Plug your ESP32S board into your computer with the USB cable. You should see a red light on the board, which means it is powered up.

Open the Yo-Yo Firmware Uploader and select the device in the drop down menu. You may need to press “refresh list” if you do not see it in your list.

Your board's serial port should appear as '/dev/cu.SLAB_USBtoUART'

If the device doesn't appear, double check that your USB cable has a data line. Some USB cables only have power lines, as they are used for charging only.

Leave the 'Erase Wifi Details' box unticked.

Use the 'project' drop-down menu to select which device you are making.

The image shows "Light Touch" as the selected project. Click on the menu to see other projects – we will be adding more periodically.

When you're ready, click on Upload to upload the latest firmware.

When prompted, hold the BOOT button on your board to set it to "programming mode". You can let go of the button once you see the text "Writing" in the console text.

If you receive an error, please make sure you have selected the correct device in the Firmware Uploader, and that you have pressed the 'BOOT' button as described above.

When the uploader finishes transferring the firmware to the device, it will say "Success!"

In the future, if you want to reset a device to factory settings, you can do so by ticking the "Erase WiFi Details" box and re-uploading the firmware.

If you have another device to set up, you can repeat the previous step with the second ESP32S board.

Unplug the first device from your computer to make sure that you that you upload the firmware to the second device.

Select the device in the drop down menu of the Yo-Yo Firmware Uploader . You may need to press “refresh list” if you do not see it in your list.

There are two main methods for setting up the network and pairing Yo–Yo Machines. In the first, both devices are set up in the same space, before one of them is sent to a remote location. In the second, devices are set up in separate spaces while coordinating with someone over the phone.

Both methods are covered in the following guide, but setting up a pair in the same space is shown as the primary method.

Power up the first ESP32S (with uploaded firmware) using a USB port or USB power supply and wait 10 seconds.

Now that the firmware is loaded, you can power your ESP32Ss from any USB power supply – there is no need to use a computer anymore.

If you are setting up two devices in the same space, turn on the second ESP32S at least 10 seconds after the first. If you are setting them up remotely, you do not need to synchronise in this way. You should still wait at least 10 seconds before proceeding so the ESP32Ss can establish a network.

With your mobile device or computer, connect to the newly created Wi-Fi network named “Yo-Yo-####” with the password “blinkblink”. If you are viewing these instruction online on our website, use another device to connect to the new network so you can keep the instruction open. This procedure is the same whichever method you are using.

Android users may be prompted with a "Sign in to a Wi-Fi network" notification. Click this to open the captive portal (next).

A captive portal should open automatically.

If the captive portal doesn't open on the device you are using, you may have to try with an alternative smartphone / tablet / laptop.

The captive portal will show the 5 Wi-Fi networks with the strongest signals. Sometimes you may not see the network that you would like to connect to, if this is the case, move your hardware closer to your router.

The ESP32S board cannot connect to Wi-Fi networks with names longer than 31 characters. If your Wi-Fi network's name is too long, then you will need to change it to a shorter name to complete the build.

Fill in the prompts with credentials for the Wi-Fi network that you want to connect to.

When you are setting up two devices in the same space, you also have the option to include the Wi-Fi credentials of the network you want to send the device to. When you send the second device to someone, it will then automatically connect to their network.

Including the Wi-Fi credentials of the remote network when setting up a pair will store both the home and remote network credentials to both devices, so it will not matter which device you send away. For security purposes, the Wi-Fi credentials can never be retrieved from the devices later.

The image here shows two devices being set up in the same space. Note that the Yo-Yo codes have been exchanged automatically. Information on how to enter codes manually for remote setup is in the next step.

If you are setting up two devices in the same space, they have already exchanged Yo-Yo Codes automatically. Feel free to skip this step and press "Save"

Copy the text under the heading “Your Yo-Yo Code”.

Send your Yo–Yo Code to your partner via SMS, email, etc., in exchange for the one from their device.

Enter the Yo-Yo Codes for the partner devices in the text field named “Remote Yo-Yo Code”. It should be in the same format as yours eg: “4289 423988”. Once the forms are complete, press “Save”.

Wait for the devices' blue LEDs to blink 3 times to confirm the local wifi details are correct. If these details have been inputted incorrectly, please reconnect to the Yo-Yo-#### network and try again.

Once both devices have confirmed they can connect to their respective wifi networks, the connection between the devices can be tested. This is done by pressing the “BOOT” button of one device to blink the on-board led of the other.

Gather your components and take a moment to identify them.

Both small and large fans are shown in this picture, but you will need to use the fan specific to the enclosure design you decide to build.

Here's what our final circuit will look like. If you use the same colours of jumper wires, it will make it easier to identify any mistakes.

SIG = MOSFET signal

OUT = PIR sensor output

VDD = Supply voltage

GND = Ground

Bread boards are used to create quick connections between electronic components.

They have sockets that are electrically connected in rows. The connected sockets are shown as green lines in this diagram.

Jumper leads and components placed in these rows will be connected together.

Place one side of the ESP32S onto the other side of the breadboard. The side used should be the same side as the button labelled EN.

Make sure all the pins are lined up, leaving an empty hole on either side of the breadboard. Give the ESP32S a good solid push to plug it all the way into the breadboard.

Place the MOSFET module on the top left side of your breadboard.

Use 3 male to male jumper wires to plug the MOSFET module into the ESP32S as pictured.

Plug two male-to-male jumper wires into the MOSFET module's V+ and V- screw terminals

Plug the other ends of the jumper wires into the fan's white connector.

Connect the MOSFET module's VIN terminal to the ESP32S's VIN pin with another jumper wire.

If you are using the larger 60mm fan, the process of adding the fan is identical.

Connect the PIR sensor's 5V pin to VIN on the ESP32S.

Connect the PIR sensor's output pin to pin D14 on the ESP32S.

Connect the PIR sensor's ground pin to GND on the ESP32S.

Some PIR sensors have slightly different pin configurations. Please double check these before you plug them in! They should always have 5V, output, and ground.

Plug in your USB micro cable.

Make another device using the same steps.

You can make both devices in the same household and post one to your remote partner. Alternatively, they can be made remotely and paired via the internet.

Use the Network Setup guide to pair two devices. We assume you'll do before you start assembling the electronics, but you can link or re-link them at any time.

When you power up the devices the solenoid moves in and out to indicate that it has been plugged in correctly. Also the blue LED onboard the ESP32S board should blink three times to show the network connection is working.

Be careful not to put fingers or foreign objects near the fan blades with the device powered on.

By default the fan will remain on for 10 seconds after the PIR detects motion, but this can also be changed to 1, 3 or 30 seconds.

To change the default time from 10 seconds to 1 second, add two jumper leads between pins 25 and 26, and GRD.

To change the default time from 10 seconds to 3 seconds, add a jumper lead between pin 26 and GRD.

To change the default time from 10 seconds to 30 seconds, add a jumper lead between pin 25 and GRD.

Wave your hand around one of the PIR sensors. You should be able to see fan spin on the other device.

Try this again on the other PIR sensor and make sure the other fan spins.

Be careful not to put fingers or foreign objects near the fan blades with the device powered on.

Now that your device is working you can now think about what kind of enclosure you want to encase it in.

We have a few different examples of enclosure design or feel free to invent your own!