STEIM: Week 1. Light Sensor Research

We are undertaking a 2 week residency at STEIM: Studio for Electronic Instrumental Music in Amsterdam. STEIM is a centre of excellence for research into the design and theory of creative interfaces and instrument building of new electronic music instruments. Having created instruments such as the Cracklebox and developed the ‘Touch’ approach; we wanted to call  on their expertise to help develop our work in terms of light input and gesture and contextualise our practice in line with contemporary alternative instruments and interfaces.

We charted our experiments through video and notebook work. We began by investigating different types of light sensors; currently our machines use LDRs, these are quite low in responsivity. This is not necessarily a negative trait, as it depends what the environmental and performative  surroundings and effects you are working with or trying to achieve. For example you may wish a dancer or gestural player to want a slower transition in pitch rather than a quicker change. We began testing with photo transistor circuits followed by photodiodes, which have a quicker response to changes in light:

We discussed with Frank at STEIM about the potential to use an Infa Red proximity sensor, which has an analog output but connects to Arduino so you can map the parametres and thresholds. The LDRs have incredibly wide ranging frequency spectrums, so this could be a way of limiting or gating the very high theremin sounds; which was brought up in the focus groups. One concern with this, is that we want to ensure we keep our ANALOGUE SYNTH sounds, so if we were to include this, we would need to work on an analogue to digital convertor through a Teensy microcontroller, which would make our machines hybrids, not a bad thing, but if we were going to sell hybrid units the price would go up significantly with these expensive parts.

Infrared Proximity Sensor - Sharp GP2Y0A21YK

We are undertaking a 2 week residency at STEIM: Studio for Electronic Instrumental Music in Amsterdam. STEIM is a centre of excellence for research into the design and theory of creative interfaces and instrument building of new electronic music instruments. Having created instruments such as the Cracklebox and developed the ‘Touch’ approach; we wanted to call  on their expertise to help develop our work in terms of light input and gesture and contextualise our practice in line with contemporary alternative instruments and interfaces.

We charted our experiments through video and notebook work. We began by investigating different types of light sensors; currently our machines use LDRs, these are quite low in responsivity. This is not necessarily a negative trait, as it depends what the environmental and performative  surroundings and effects you are working with or trying to achieve. For example you may wish a dancer or gestural player to want a slower transition in pitch rather than a quicker change. We began testing with photo transistor circuits followed by photodiodes, which have a quicker response to changes in light:

 

We discussed with Frank at STEIM about the potential to use an Infa Red proximity sensor, which has an analog output but connects to Arduino so you can map the parametres and thresholds. The LDRs have incredibly wide ranging frequency spectrums, so this could be a way of limiting or gating the very high theremin sounds; which was brought up in the focus groups. One concern with this, is that we want to ensure we keep our ANALOGUE SYNTH sounds, so if we were to include this, we would need to work on an analogue to digital convertor through a Teensy microcontroller, which would make our machines hybrids, not a bad thing, but if we were going to sell hybrid units the price would go up significantly with these expensive parts.

Infrared Proximity Sensor - Sharp GP2Y0A21YK

 

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