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Check that none of the unconnected pins require pull-up or pull-down resistors t...
D

darknigh

@copilot Check that none of the unconnected pins require pull-up or pull-down resistors to ensure proper function.
2y

copilot

To ensure proper function, let's review the unconnected pins of each component in your project to determine if any require pull-up or pull-down resistors.
Components Review SN7400N Quad 2-Input NAND Gate (U1):
  • Pins 1, 2, 4, 5, 9, 10, 12, 13: These are input pins (1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B) and typically could require pull-up or pull-down resistors to avoid floating states.
  • Pins 3, 6, 8, 11: These are output pins (1Y, 2Y, 3Y, 4Y) and generally do not need pull resistors.
  • Pins 7, 14: These are power (GND, VCC) pins and shouldn't need pull resistors.
IRA-S230ST01 Passive Infrared Sensors (PIR1 and PIR2):
  • Pins 1, 2, 3: DRAIN, SOURCE, GND. Typically, these do not require pull resistors.
SN74LS02NSR Quad 2-Input NOR Gate (U3):
  • Pins 2, 3, 5, 6, 8, 9, 11, 12: These are input pins (1A, 1B, 2A, 2B, 3A, 3B, 4A, 4B) and typically could require pull-up or pull-down resistors to avoid floating states.
  • Pins 1, 4, 10, 13: These are output pins (1Y, 2Y, 3Y, 4Y) and generally do not need pull resistors.
  • Pins 7, 14: These are power (GND, VCC) pins and shouldn't need pull resistors.
DM7404M Hex Inverter (U2):
  • Pins 1, 3, 5, 9, 11, 13: These are input pins (A1, A2, A3, A4, A5, A6) and typically could require pull-up or pull-down resistors to avoid floating states.
  • Pins 2, 4, 6, 8, 10, 12: These are output pins (Y1, Y2, Y3, Y4, Y5, Y6) and generally do not need pull resistors.
  • Pins 7, 14: These are power (GND, VCC) pins and shouldn't need pull resistors.
Recommendations
  • For the U1 input pins and U3 input pins:
    • Connect U1:1 (1A), U1:2 (1B), U1:4 (2A), U1:5 (2B), U1:9 (3A), U1:10 (3B), U1:12 (4A), and U1:13 (4B) to 10kΩ pull-down resistors.
    • Connect U3:2 (1A), U3:3 (1B), U3:5 (2A), U3:6 (2B), U3:8 (3A), U3:9 (3B), U3:11 (4A), and U3:12 (4B) to 10kΩ pull-down resistors.
  • For the U2 input pins:
    • Connect U2:1 (A1), U2:3 (A2), U2:5 (A3), U2:9 (A4), U2:11 (A5), and U2:13 (A6) to 10kΩ pull-down resistors.
This configuration will ensure that no input pins of the logical ICs are floating and causing unexpected behavior. If anything about these connections needs adjusting, please let me know!
2y
1
U3

[Example] Arduino MKR Memory Shield e0a9