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The second assignment was to build a fancy electronic switch. I built a construction of a basic 555 timer circuit (creating a square wave oscillation connected to a speaker) which power on/off is triggered by a connection of two contacts. I put the contacts into a water filled glass tube which was set over a flame. Immediately after the water is boiling the expanded water volume let current pass to the circuit. | The second assignment was to build a fancy electronic switch. I built a construction of a basic 555 timer circuit (creating a square wave oscillation connected to a speaker) which power on/off is triggered by a connection of two contacts. I put the contacts into a water filled glass tube which was set over a flame. Immediately after the water is boiling the expanded water volume let current pass to the circuit. | ||
[[Image:Sketch_temp_switch.jpg]] | |||
[[Image:Sketch_switch_ha_1.jpg]] | [[Image:Sketch_switch_ha_1.jpg]] | ||
[[Image:Switch_tube.jpg]] | |||
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The sensor clamp is put in a box to avoid daylight coming into the photocell and bringing unwanted resistance values into the circuit. | The sensor clamp is put in a box to avoid daylight coming into the photocell and bringing unwanted resistance values into the circuit. | ||
Breadboard Sketch: | For transportation and handling the sensor clamp and box contacts were soldered on two 6.3mm audio jacks and inlets. | ||
[[Image:clamp_jack.jpg]] | |||
Breadboard Sketch (5V Arduino resistance values): | |||
[[Image:sketch_matrix_pulse_meter.jpg]] | [[Image:sketch_matrix_pulse_meter.jpg]] | ||
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<videoflash type="youtube">cCaQeeis1ug|700|450</videoflash> | <videoflash type="youtube">cCaQeeis1ug|700|450</videoflash> | ||
[[Image:Pulse_inside_1.jpg]] | |||
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This is another version (improvement?) of my wet cardboard piano without the need of water. I put another 555 mono stable timer and put multiple fixed 1k ohms resistors between pin 7 and 6. The leads of the resistors are soldered to some copper wire which is seen under the fake piano keys. The synth can be played by connecting the copper-wire hand (pin 7) and the different leads of the keys (pin 6). Its also possible to take the hand into your hand and play the piano by touching the copper curls on the bottom. Due to the resistance of the human body the pitch of the tones is much more lower than in the first mode. | This is another version (improvement?) of my wet cardboard piano without the need of water. I put another 555 mono stable timer and put multiple fixed 1k ohms resistors between pin 7 and 6. The leads of the resistors are soldered to some copper wire which is seen under the fake piano keys. The synth can be played by connecting the copper-wire hand (pin 7) and the different leads of the keys (pin 6). Its also possible to take the hand into your hand and play the piano by touching the copper curls on the bottom. Due to the resistance of the human body the pitch of the tones is much more lower than in the first mode. | ||
[[Image:555_synth.jpg]] | |||
[[Image:inside_555_synth.jpg]] | |||
<videoflash type="youtube">7B_43t2jaZo|700|450</videoflash> | <videoflash type="youtube">7B_43t2jaZo|700|450</videoflash> | ||