green LED is off. When you connect the device to a computer via USB, the green LED will
start blinking slowly. The blinking continues until it receives a particular message from the
computer indicating that the drivers are installed correctly. After the programmer gets this
message, the green LED will be on, but it will flicker briefly when there is USB activity.
• Another
red
LED is located near the header for the auxiliary processor’s TX line. This LED
is tied to the TX line, so it will flicker whenever the auxiliary processor is transmitting TTL-
level serial bytes from the computer. This LED will also blink when the auxiliary processor
powers up to indicate bad startup conditions.
Two blinks
indicates that a brown-out reset
was triggered: the processor’s VDD dropped below 3.0 V. If this happens to you, check your
power connections and battery voltage, and make sure you are not drawing too much power
from the board.
Pololu Orangutan SVP User’s Guide
© 2001–2019 Pololu Corporation
4. Module Pinout and Components
Page 15 of 43
