Using the latest Raspberry Pi OS 32bit, fully updated on a Pi4 2GB.
Linux raspberrypi 5.4.72-v7l+ #1356 SMP Thu Oct 22 13:57:51 BST 2020 armv7l GNU/Linux
The ZymKey appears to work fine with the slow blue led blinking. Within a few seconds of starting code that reads MCP3008 over SPI the ZymKey flashes rapidly then gives 8 flashes which I believe is i2c comms problem.
The ZymKey port is configured to GPIO24.
from gpiozero import MCP3008
import time
voltages = []
voltages.append(MCP3008(channel=7))
voltages.append(MCP3008(channel=6))
voltages.append(MCP3008(channel=5))
voltages.append(MCP3008(channel=4))
voltages.append(MCP3008(channel=3))
voltages.append(MCP3008(channel=2))
while True:
for voltage in voltages:
print(str(voltage.value)+' ',end='')
print('')
time.sleep(0.1)