# Hagiwo 6ch drum sequencer + 4x4 matrix keypad

**URL:** <https://lookmumnocomputer.discourse.group/t/hagiwo-6ch-drum-sequencer-4x4-matrix-keypad/7349>\
**Category:** DIY STUFF\
**Created:** [July 7, 2024, 3:24pm UTC](https://lookmumnocomputer.discourse.group/t/hagiwo-6ch-drum-sequencer-4x4-matrix-keypad/7349 "2024-07-07T15:24:53Z")\
**Posts on this page:** 5\
**Page:** 6

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**Author:** ![Marty](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/marty/32/30770_2.png) [@Marty](https://lookmumnocomputer.discourse.group/u/Marty)\
**Post date:** [September 18, 2025, 5:28pm UTC](https://lookmumnocomputer.discourse.group/t/hagiwo-6ch-drum-sequencer-4x4-matrix-keypad/7349/101 "2025-09-18T17:28:49Z")

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Hi, yes, i rembered the i2c scanner script but it shows nothing readable from the monitor. Only empty small squares with question marks in between. Need to Google it. Im sure ill find a script or something that will show the address

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**Author:** ![Marty](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/marty/32/30770_2.png) [@Marty](https://lookmumnocomputer.discourse.group/u/Marty)\
**Post date:** [September 18, 2025, 6:58pm UTC](https://lookmumnocomputer.discourse.group/t/hagiwo-6ch-drum-sequencer-4x4-matrix-keypad/7349/102 "2025-09-18T18:58:50Z")

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Finally, after various errors etc, etc, i managed it to get it working. This time on address 0x61. Yay! I now have all the modules with oled equipped with screensavers. All credits to you my friend. Have a nice evening

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**Author:** ![clarionut](https://avatars.discourse-cdn.com/v4/letter/c/34f0e0/32.png) [@clarionut](https://lookmumnocomputer.discourse.group/u/clarionut)\
**Post date:** [September 18, 2025, 7:38pm UTC](https://lookmumnocomputer.discourse.group/t/hagiwo-6ch-drum-sequencer-4x4-matrix-keypad/7349/103 "2025-09-18T19:38:34Z")

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Really glad you got them working!

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**Author:** ![Marty](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/marty/32/30770_2.png) [@Marty](https://lookmumnocomputer.discourse.group/u/Marty)\
**Post date:** [September 20, 2025, 9:53pm UTC](https://lookmumnocomputer.discourse.group/t/hagiwo-6ch-drum-sequencer-4x4-matrix-keypad/7349/104 "2025-09-20T21:53:42Z")

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What kind of quantizer do you have?

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**Author:** ![clarionut](https://avatars.discourse-cdn.com/v4/letter/c/34f0e0/32.png) [@clarionut](https://lookmumnocomputer.discourse.group/u/clarionut)\
**Post date:** [September 21, 2025, 10:16am UTC](https://lookmumnocomputer.discourse.group/t/hagiwo-6ch-drum-sequencer-4x4-matrix-keypad/7349/105 "2025-09-21T10:16:53Z")

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I have a quad quantizer inspired by [Hagiwo’s design](https://note.com/solder_state/n/nb8b9a2f212a2) for a dual quantizer. It uses a microcontroller board with the same RP2040 processor, and the screen display for setting the scale is similar, but the rest of the hardware is completely different. It uses a MAX5715 BAUD quad 12-bit DAC (SPI of course!) with fully buffered outputs, op-amp buffered trigger outputs and has a dedicated EEPROM to store the settings. The RP2040 is dual core, so I used an I2C OLED (the display only changes when setting the scale) and I2C EEPROM controlled by one core, with the time-critical trigger handling and SPI communication with the DAC controlled by the other.

I [posted about it](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/6146) and various other modules way back in November 2023 when my synth was desparately in need of a second cabinet (now it needs a third 🤪). Details are on [GitHub](https://github.com/clarionut/Quad_Quantiser).

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