Week 9 The electric yellow brick road

The electric yellow brick road

For electic design week.

We tested couple of different measurements from the Quentorres board that we manufactured during week 5.

Wires

We measured different things from our Quentorres borad using multimeter. Volts were measured with multimeter prongs directly toughing either the pins or milled wires (i.e. in parallel). The current (or amperage) was measured using jumper cables with multimeter closing the circuit (i.e. in series).

Measurement points for volt measurements are listed here:

The measurement points for empty wire voltage.

The measurement points for input voltage.

The measurement points for output voltage when signal is not sent.

The measurement points for output votage when signal is sent.

The measurement points for voltage of unused pin.

Voltage measurements:

Measured	Volts	Description
Plain wire	0 V	Measured when board was not connected, between two nearby points connected by a copper plating.
Unused wire	0.47 mV	Between ground and a pin that was neither input nor output pin.
Input pin	0.01 mV	Between ground and a input pin.
Output pin down	0.04 mV	Between ground pin and output pin when no signal was sent.
Output pin up	3,2 V	Between ground pin and output pin when a signal was sent through it.

Current measurements:

Measured	Amps	Description
Input pin	0 mA?	Current along the wire leading from the button to the input pin, when the button was pressed.
LED	0.68 mA	Current along the wire leading to the LED, when it was on.

We also measured the power consumption of the XIAO RP-2040 board from USB. When the board ran the simple one button turn one LED on code, it took 5.12V and 0.00A of power. The consumption did not appear to change based on the button state or the LED state. That was most likely because our measuring device could only measure one hundreth of an amp change.

Button bouncing

We wanted to test signal bouncing when a button is pressed. At first we though about using the Quentorres board, but after we hooked it up to the oscillator, we did not see any kind of bounce in the signal. The signal just went up when the button was pressed, and bown when it was not.

So we tried some bigger switches. I took the button from my Quiz button assembly, and hooked power to it. Then I added oscillator to it in parallel, and tried to measure the bounce. I am not exactly sure what we measured, but there appeared to be some form of bounce. Actual measurements for the oscillator was not done.