I try to connect HC-SR04 ultra sonic sensor to gopigo with 2.54mm jumper cable (here)
But I can’t insert the end of cable into gopigo.
Please let me know the specification of the connector. Can I use 4p 2.54mm groove connector for that?
You’ll have to use something like https://www.seeedstudio.com/item_detail.html?p_id=1565 or https://www.seeedstudio.com/item_detail.html?p_id=1020 to take the connections out of the Grove connector. You should also check this out : http://www.dexterindustries.com/topic/multiple-ultrasonic-sensors-on-a-gopigo/ for more information about connecting the HC-SR04 to the GoPiGo.
-Karan