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<blockquote data-quote="deeps" data-source="post: 10271533" data-attributes="member: 87753"><p>rp2040-tiny pros:</p><p>- very thin - no need to remove any on-board components</p><p>- resistors preattached</p><p>- can be re-flashed via usb even after installation in a switch, since the usb connector does not have to be removed</p><p></p><p>rp2040-tiny cons:</p><p>- clone boards that don't work very well are circulating, must buy directly from waveshare to avoid them</p><p>- preattached resistors are 47 ohm - some switches need 100 ohm on dat0/cmd for ofw to work properly</p><p>- preattached resistors are very small (0201) and therefore rather difficult to replace</p><p>- no obvious space on the board for additional resistors, if replacing the existing ones isn't an option</p><p>- slightly more expensive than rp2040-zero</p><p></p><p>rp2040-zero pros:</p><p>- plenty of room for adding rather big (0805) resistors directly on the board without anything sticking out</p><p>- very common board, high availability</p><p>- slightly cheaper than rp2040-tiny</p><p></p><p>rp2040-zero cons:</p><p>- too thick - need to remove several on-board components with hot air (usb connector, buttons, LDO (optional)) for it to fit in the switch</p><p>- no resistors preattached, need to add 100/100/47 ohm for dat0/cmd/clk, preferably 0805 size</p><p>- not flashable via usb after installation, since usb connector must be removed. updating via picofly-toolbox works fine though</p><p></p><p>To summarize, it's a matter of taste. Most people seem to prefer the rp2040-tiny. Both work just fine.</p><p>[automerge]1697662950[/automerge]</p><p></p><p>The resistor is helpful if the cpu-mosfet cable between chip and mosfet ever gets disconnected while the switch is powered, which will result in the gate point "floating" which might result in the mosfet activating and burning out. As long as you remember to disconnect the battery before installation and don't power up again before the job is done and all points are measured, there's no point in adding a pull-down resistor.</p></blockquote><p></p>
[QUOTE="deeps, post: 10271533, member: 87753"] rp2040-tiny pros: - very thin - no need to remove any on-board components - resistors preattached - can be re-flashed via usb even after installation in a switch, since the usb connector does not have to be removed rp2040-tiny cons: - clone boards that don't work very well are circulating, must buy directly from waveshare to avoid them - preattached resistors are 47 ohm - some switches need 100 ohm on dat0/cmd for ofw to work properly - preattached resistors are very small (0201) and therefore rather difficult to replace - no obvious space on the board for additional resistors, if replacing the existing ones isn't an option - slightly more expensive than rp2040-zero rp2040-zero pros: - plenty of room for adding rather big (0805) resistors directly on the board without anything sticking out - very common board, high availability - slightly cheaper than rp2040-tiny rp2040-zero cons: - too thick - need to remove several on-board components with hot air (usb connector, buttons, LDO (optional)) for it to fit in the switch - no resistors preattached, need to add 100/100/47 ohm for dat0/cmd/clk, preferably 0805 size - not flashable via usb after installation, since usb connector must be removed. updating via picofly-toolbox works fine though To summarize, it's a matter of taste. Most people seem to prefer the rp2040-tiny. Both work just fine. [automerge]1697662950[/automerge] The resistor is helpful if the cpu-mosfet cable between chip and mosfet ever gets disconnected while the switch is powered, which will result in the gate point "floating" which might result in the mosfet activating and burning out. As long as you remember to disconnect the battery before installation and don't power up again before the job is done and all points are measured, there's no point in adding a pull-down resistor. [/QUOTE]
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