Resistance-to-Voltage Interface Module

Analog Front End for Resistive Sensors

Designed for sensing elements where the measurand produces a change in electrical resistance.

Signal Architecture

Sensor ΔR → Electrical Excitation → R-to-V Conversion → Signal Conditioning → VOUT

The module translates resistance variation into a corresponding analog voltage response, eliminating the need to independently design the sensor excitation and conversion stage.

Engineering Considerations

Interface performance depends on the sensor's:

Baseline resistance • ΔR range • sensitivity • excitation requirement • dynamic response • required VOUT span

Matching the interface to the expected sensor range is important because an incorrectly selected conversion range can reduce sensitivity or drive the output toward saturation.

Suitable Devices

Chemiresistors • Metal-oxide sensors • Conductive polymers • Nanocomposites • Resistive thin films • Strain-sensitive devices • Gas and chemical sensors

Output Integration

Resistive Sensor → R-to-V Module → VOUT → ADC → MCU / DAQ

The resulting voltage can be sampled, calibrated, logged and processed by the downstream acquisition system.

Capacitance-to-Voltage Interface Module

Analog Front End for Capacitive Sensors

Designed for sensing elements where the measurand modulates device capacitance.

Capacitive measurement requires particular attention to baseline capacitance, ΔC, parasitic capacitance, interconnect capacitance, excitation conditions and electrical noise.

Signal Architecture

Sensor ΔC → AC Excitation → Capacitive Transduction → Signal Conditioning → VOUT

The module converts capacitance variation into a corresponding analog voltage, providing a practical interface between the capacitive sensor and downstream ADC.

Engineering Considerations

Interface selection should consider:

Baseline capacitance • ΔC range • parasitic capacitance • excitation frequency • cable/interconnect effects • required resolution • VOUT range

For small capacitance changes, PCB layout and sensor-to-interface interconnection can become part of the measurement system itself and should be controlled carefully.

Suitable Devices

Capacitive IDEs • Dielectric sensors • Humidity sensors • Chemical sensors • Thin-film capacitive devices • Proximity sensors • Experimental capacitive transducers

Output Integration

Capacitive Sensor → C-to-V Module → VOUT → ADC → MCU / DAQ

Why an Interface Module?

A Microcontroller ADC Measures Voltage—not Sensor Physics.

Connecting an experimental sensor directly to an ADC does not address the electrical requirements of the transducer.

The interface module performs the critical analog functions upstream of digitization:

• Excitation — establishes the sensor's electrical operating condition.

• Transduction — converts ΔR or ΔC into voltage variation.

• Range Matching — maps the expected sensor response into a useful output span.

• Signal Conditioning — prepares the analog signal for acquisition.

• ADC Interface — provides an accessible voltage for digitization.

This creates a defined boundary between the sensor domain and digital domain.

Designed Around the Research Workflow

Spend More Time on the Sensor, Less Time Rebuilding Measurement Electronics

For a materials or sensor researcher, developing the sensing layer itself may already involve:

Material synthesis → deposition → functionalization → device fabrication → characterization → exposure testing → optimization

Adding analog circuit design, PCB development and signal-conditioning troubleshooting creates another engineering workload.

Schnaiffer's objective is to make that interface available as a dedicated electronic layer.

YOU DEVELOP: Sensing material • Functionalization • Device • Experiment

WE ENGINEER: Sensor interface • Signal conversion • Analog output • Electronic integration

YOU ACQUIRE: Voltage • Digital data • Response curves • Experimental results

Schnaiffer Sensor Interface Modules

Engineering the electronic link between experimental sensors and digital acquisition.

Frequently asked questions

Can the glass or quartz IDE be reused?

Reuse depends on the deposited material and cleaning method. Aggressive chemicals, abrasion and repeated sonication may damage the metal pattern or adhesion layer. A cleaning protocol should be validated on a spare device before routine reuse.

Can I solder wires directly to the gold pads?

Direct soldering may damage a thin-film electrode. Spring contacts, conductive epoxy, anisotropic conductive materials or a compatible connector fixture are generally safer. The selected connection method should be tested for contact resistance and mechanical stability.

Is quartz always better than glass?

No. Quartz provides advantages under specific thermal and optical conditions, but glass is often the more economical and practical choice for routine room-temperature sensing.

Can Schnaiffer change the IDE geometry?

Yes. Custom chip size, finger geometry, active area and contact-pad layout can be reviewed. Custom production depends on fabrication feasibility and order volume.

Request the IDE catalogue, dimensional drawings, price quotation or custom-design review.

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