Silicon Laboratories EFM8SB2-SLSTK2011A User Manual page 8

5.2 Joystick
The kit has an analog joystick with 8 measureable positions. This joystick is connected to the EFM8 on the P1.7 pin and uses different
resistor values to create voltages measurable by the ADC0.
Direction
Center press
Up (N)
Up-Right (NE)
Right (E)
Down-Right (SE)
Down (S)
Down-Left (SW)
Left (W)
Up-Left (NW)
Note:
1. These calculated values assume a VMCU of 3.3 V.
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Figure 5.2. Joystick
Table 5.1. Joystick Resistor Combinations
Resistors Combinations (kΩ)
0.1
0.1 + 10
60.4
60.4 + 10
(N // E ) 21.34
=
(N // E ) + 10 21.34 + 10
33
33 + 10
(S // E ) 7.67
=
(S // E ) + 10 7.67 + 10
10
10 + 10
(S // W )
=
(S // W ) + 10 6 + 10
15
15 + 10
(N // W ) 12.01
=
(N // W ) + 10 12.01 + 10
UG238: EFM8SB2-SLSTK2011A User's Guide
Expected UIF_JOYSTICK Voltage (V)
6
Peripherals
1
0.033
2.831
2.247
2.533
1.433
1.650
1.238
1.980
1.801
Rev. 0.3 | 8