During actual use, it was found that the 250mA output current of the TL431 chip was insufficient to power numerous modules. Therefore, a three-way power supply was adopted, requiring the use of a voltage regulator chip with a larger output power capacity. 
External module access: 
The button 
circuit uses an external debugging pin header. 
This open-source project consists of two boards, an older and a newer one. The newer version is an improved board developed after issues were discovered during debugging. 
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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.
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