It's just that I'm selling them at about cost to speed the beta test process along. I imagine that a kit would go for $50 to $60 unassembled once the board is out of beta given that the parts cost is around $35.
Sorry about the confusing statement. I meant that the enable pin's logic was inverted from the way it works on the Pololu's. The Pololu drivers are enabled when the enable line is pulled low. These drivers are enabled when the enable line is pulled high. If you leave the firmware set for Pololu drivers the enable line will be pulled high on startup before the motor power is on. With this board smoke emission may not be such an issue because the relay enforces some of the required power on sequencing. Specifically the driver logic supply (5V) will always be on before the relay can be turned on to supply 12V. You can look at the Gen7T topic in Gen N + 1 for a more thorough discussion. I should probably edit that statement. It was true for Gen7T and I copied much of the Sanguish page from that page, but I don't think there's much risk with the Sanguish board.
Sorry about the confusing statement. I meant that the enable pin's logic was inverted from the way it works on the Pololu's. The Pololu drivers are enabled when the enable line is pulled low. These drivers are enabled when the enable line is pulled high. If you leave the firmware set for Pololu drivers the enable line will be pulled high on startup before the motor power is on. With this board smoke emission may not be such an issue because the relay enforces some of the required power on sequencing. Specifically the driver logic supply (5V) will always be on before the relay can be turned on to supply 12V. You can look at the Gen7T topic in Gen N + 1 for a more thorough discussion. I should probably edit that statement. It was true for Gen7T and I copied much of the Sanguish page from that page, but I don't think there's much risk with the Sanguish board.