34 lines
819 B
Plaintext
34 lines
819 B
Plaintext
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#include <Wire.h>
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#include "Adafruit_MCP23008.h"
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// Basic toggle test for i/o expansion. flips pin #0 of a MCP23008 i2c
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// pin expander up and down. Public domain
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// Connect pin #1 of the expander to Analog 5 (i2c clock)
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// Connect pin #2 of the expander to Analog 4 (i2c data)
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// Connect pins #3, 4 and 5 of the expander to ground (address selection)
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// Connect pin #6 and 18 of the expander to 5V (power and reset disable)
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// Connect pin #9 of the expander to ground (common ground)
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// Output #0 is on pin 10 so connect an LED or whatever from that to ground
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Adafruit_MCP23008 mcp;
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void setup() {
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mcp.begin(); // use default address 0
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mcp.pinMode(0, OUTPUT);
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}
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// flip the pin #0 up and down
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void loop() {
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delay(100);
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mcp.digitalWrite(0, HIGH);
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delay(100);
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mcp.digitalWrite(0, LOW);
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}
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