I got hold of a gripper arm and it has open/close rotate left/rotate right functions, it works on 14-18v and has two wires for each of the main functions (and uses polarity switch ) Anybody have any ideas on how i could incorporate/ connect this gripper/manipulating arm into a BR2 ROV circuit boa…

Hey @Mac1 ! Maybe you could use a brushed ESC . They take a PWM and are able to switch polarity (1500us stops, lower goes one direction, higher goes the other one). Then you can just use the same control style we use in the newton gripper, using servoX_min/max_momentary.

Hi murdo, Willian asked me to draw up a quick schematic for you: [Gripper (1)] Using Aux pins 1 and 2, you should be able to control opening/closing with a joystick button mapped to servo1_max/min_momentary, and rotating left/right with a joystick button mapped to servo2_max/min_momentary. Momen…

Hello Eliot, OK great thanks to you and Willian , I will order the parts and try , much appreciated

Hello Eliot, I have been looking at ESC 4s and they all seem to have 3 output wires/connections https://www.ebay.co.uk/itm/284164277080?hash=item422982c358:g:bZEAAOSwzn9gEuCf would these work correctly when i only need +/- feeds to each gripper motor ? would i only need to use two of the 3 output …

Hi @Mac1 , You need a brushed ESC, not a brushless one!

Hello Willian, sorry to bother you , I have looked all over Amazon and e-bay but i cannot find any brushed ESC 4S that will work between 12-16/18 V. all i can find is either 2-3s or they are lower power rated than 12 V any helpful links to source the correct brushed ESC thanks appreciate

hello willian is this the correct unit ? <a href="https://www.ebay.co.uk/itm/174574464657?epid=20044123919&_trkparms=ispr%3D1&hash=item28a572ee91:g:wX4AAOSwU41f6Xh~&amdata=enc%3AAQAFAAACgBaobrjLl8XobRIiIML1V4Imu%252Fn%252BzU5L90Z278x5ickkSG%252BOFgrj2Yvbvmrj2TAdM3OC5XqQ8GWbvmOCKgv%252BnOqTpDhnMNzHzN60p40YIrb%252B7jF6ufEFvDRfs2McfevxGUSvnKWi46LRk8YKxvKyRJyhDobebjhJpZpTyOfrT7JPRTiraphCGA38d8%252FHnkQkAuDbn0xaohpJ645saqk%252F8ct5Ogx%252FWT94WzsdGaMLOgfsK4MrJYXHY9vAfu6B2b%252FpJ6FRQc75Gko0%252BohvQwh7siJxX6yD6zvB8mpgh2fcibgJkPBdDnVErCQNnrZSPPBiQo6MQ%252FpVog8pSLVn8VmmqEZF6ptP4x9I51151yOFu3Ovwx02O7aiJ04a8mG8tAyFEmmPgbGcVwd8FTzNHW%252BSkaIfoQZxL6sPKoRs6W8K6gnFxE%252Bb%252BBHrr3Swj25TiJwopEpBfkvw1shUEEbSH%252FtY6Bcbwj2Fzot0vl8DONl5HAcLNv5tdxjVwDxNtb0tGwkkff%252BItLhmmxlODQpH0o%252F5L4rkZ50RJNHWf5D%252Bs%252B6oVqNrOjqe9Bf5I%252FzafTiwU8HpZsgSpX6mRxMHjL5i4YBExLJ9K26cQJukdi2dej4anrdSlmodMwk3gQiIJgfo3%252Bq2G7pUn9LWJ5m5amfnDiiP6fNdhZnGjoi2936fjFloM%252BYi9T6%252FKleAq%252BNeycSiMp82ksKEAZAmf1Lawu%252FE%252B%252FXQ%252B8c8f9jIguqaeWCkNiSUJQIvowctYo4%252FIQCpBjR73YowfFczu8dVjX5bJOxQINKRP6KqQ9890tGNudvLUkTNeds29qylKhErbPsQIy1es4eigSgS5I0KF3AQ3bOHPtj6Sv8%253D%7Ccksum%3A1745744646574679e645b2a14ee28f67438bd9f0a1c8%7Campid%3APL_CLK%7Cclp%3A2334524" class="onebox" target="_blank" rel="noopener nofollow ugc">https://www.ebay.co.uk/itm/174574464657?epid=20044123919&_trkparms=ispr%3D1&hash=item28a572ee91:g:wX4AAOSwU41f6Xh~&amdata=enc%3AAQAFAAACgBaobrjLl8XobRIiIML1V4Imu%252Fn%252BzU5L90Z278x5ickkSG%252BOFgrj2Yvbvmrj2TAdM3OC5XqQ8GWbvmOCKgv%252BnOqTpDhnMNzHzN60p40YI…

Hi murdo, How about this one? DFRobot 40A Bidirectional Brushed ESC Speed Controller (XT60 Connector) - RobotShop

hello K.deboer that one is only * Voltage range: 7V-24V (lithium battery 2S) not 4s thanks for your help and trying , I think i may have found one , awaiting willian to confirm :slight_smile:

Thanks murdo, I saw the 7-24V part. That explains why the very same controller failed for me a while back. I thought it was due to some other issue. That explains it! :stuck_out_tongue_winking_eye:

Gripper arm electrical connection

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