Differences

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--- projects:biosonification [2026/08/31 01:03] – John Harrison
+++ projects:biosonification [2026/08/31 02:07] (current) – John Harrison
@@ Line 59: / Line 59: @@
   * 3.3kΩ (R2)
   * 1MΩ (R3) — Analog Pin 0
-  * **R\* = 100kΩ – 50MΩ** between send and receive pin, with the object/foil attached
-The R\* range is a wide tunable range. A pot or a resistor+trimmer may make sense.
 Send pin changes depending on Arduino model and which timer is used:
@@ Line 80: / Line 77: @@
 The NIME paper's test used a "copper electrode roughly 5cm × 2cm", and a ~15cm rosemary plant with an electrode placed in soil. This is a documented working starting point.
-===== Hardware — board compatibility (verified from source) =====
+===== Hardware — board compatibility =====
   * All Megas work unmodified: Original Mega (ATmega1280), Mega 2560. Mega ADK carries some risk with digital pin 7 so maybe stay away.
@@ Line 139: / Line 136: @@
   * Grounding: one project reported needing the person coupled to circuit ground.
-===== Shelved =====
+===== Alternative =====
   * **AD5932 sine wave generator:** what Disney used. Cleaner than our circuit but more complicated approach for starting out.
     * [[https://pmdway.com/products/ad9833-dds-programmable-frequency-function-generator|this is a good module for testing]]
+===== Shelved =====
   * **AD5933 impedance spectroscopy:** two-electrode, measures impedance not self-capacitance. Possible module: KDT5933-013-SOU.
   * **Biopotential/electrophysiology:** more meaningful for passive environmental sensing, but every long-term result used lab-fabricated electrodes (SWCNT, thermoresponsive polymer, PEDOT:PSS). Off the table without university facilities