I have heard of the Plant Spikerbox from Backyard Brains and trying to acquire it. I want to study the electrophysical changes in common plants as Chilli, Tamarind, Papaya, etc due to environmental and human stimuli. But the devices I find are usually very expensive. Is there any DIY way of building such devices? What type of electrodes do I need? What type of wires to connect them to the plant? And what receptors can detect low-frequency electric signals? Also in the case of Plant bioacoustics, What device can I use to detect their ultrasonic sounds?

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