User Manual

VIN - This is the power input. Can be 3.3-5VDC, USE A POWER SOURCE THAT CAN HAPPILY SUPPLY 250mA,

we will regulate this down to 3.3V safely! This is probably a VBAT or USB pin not a 3.3V regulated output.

3vo - The output from the onboard 3.3V regulator, you can use up to ~50mA for other devices if you want to

power them from the same chip

GND - Power and logic ground.

SPI & Control Pins

To keep transfers speedy, we use SPI

not UART Serial.

Serial is too slow and hard to synchronize. This uses more pins

but the experience is much better!

Classic SPI Pins:

SCK - SPI Clock from your microcontroller, level shifted so can be 3-5V logic

MISO - SPI Data

from

the AirLift

the microcontroller, this is 3.3V logic out, can be read by 3-5V logic. This is tri-

stated when not selected, so you can share the SPI bus with other devices.

MOSI- SPI Data

the AirLift

from

the microcontroller, level shifted so can be 3-5V logic

CS - SPI Chip Select from the microcontroller to start sending commands to the AirLift, level shifted so can be 3-

5V logic

Required Control Pins:

BUSY - this pin is an input from the AirLift, it will let us know when its ready for more commands to be sent. This

is 3.3V logic out, can be read by 3-5V logic. This pin

must

be connected.

!RESET - this pin is an output to the AirLift. Set low to put the AirLift into reset. You should use this pin, even

though you might be able to run for a short while without it, it's essential to 'kick' the chip if it ever gets into a

locked up state. Level shifted so can be 3-5V logic

Optional Control Pins:

GP0 - this is the ESP32 GPIO0 pin, which is used to put it into bootloading mode. It is also used if you like when

the ESP32 is acting as a server, to let you know data is ready for reading. It's not required, so you can leave it

disconnected.

RXI & TXO - Serial data in and Serial data out, used for bootloading new firmware only. Leave disconnected

when not uploading new WiFi firmware to the AirLift (which is a rare occurance)

LEDs

There are 3 very tiny red, green and blue LEDs to the left of the ESP32, these are available in the Arduino library if

you'd like to PWM them for a visual alert.