It’s not uncommon for other hats, shields, etc to come by themselves, no hardware included. If you’re going to own more than one pi, i’d Recommend getting a set of 2.5 mm standoffs on eBay. 250 pieces

#accessory

All about the Ain inputs on the accessory connector. Each input connects to a Pi IO Pin and an ADC input. Clearly you can’t use both. There is also an ESD protection diode and 33ohm series resistor to

#accessory #draws #adc