Building Small Efficient and Econologic Resistors or rack of resistors in the range of a few Ohms to MegaOhms can easilly be done using ElecroFunctionnal Paper 1K or 100K. Follow these Steps to know-how and build your first eco-friendly resistor.
Volume conductive papers are practical and sustainable ressources for building DYI resistors, but other electrically resistive materials exist such as metal-oxydes, carbon-graphite or other conductive powders for the production of conductive inks. Volume conductive papers have a relatively homogeneous electrical conductivity ranging between 1kOhms/Square and 100kOhms/Square.
Reading the resistance through 2 distant Electrodes or Connectors pressing a volume conductive and reading its resistance, will show values of 1kOhms or less with 1K paper small distances between the electrodes to above hundreds of kOhms for larger distances and using the 100K paper. Check the resources specs for more information before setting up connectors.
Connectors and wiring can be made with many types of materials from conductive paper clips to a variety of metal foils, tapes or else conductive textiles. Working with conductive paper, tin-plated copper tape is the perfect materials for designing and fixing connecting pads and tails and even small circuits. Check the various examples of sensors designs to be produced with conductive papers, produce your own and test its resulting conductivity.
The resulting resistance can be reduced by reducing the element size depending on the chosen design. It can be increased by extending the size of the components. Using an insulating paper support can enable to produce connecting tails using metal tape. Various alternatives exist for connecting and wiring the component Once the component is operational it should be at least insulated and reinforced using a paper-based adhesive. For higher shear resistance (i.e. finger touch vs foot-pressure) and lower moisture variations (e.g. used inside vs outside) and short vs long life-time), Thermoplastic adhesives will provide more durable solutions.
Paper-based resistors should only be used for low power electronics (e.g. 5Watts), and should never be left plugged to a power source when not used, as for any electronic device for security reasons and energy savings. Check the various examples of sensors designs to be produced with conductive papers.