8-Channel Bluetooth System Design
Budget: $10 – $30 USD
I need a complete mixed-signal design for an eight-channel Bluetooth communication system: four inputs for data acquisition and four outputs for actuation or stimulation. The unit must span a wide frequency range—everything from standard audio bandwidth up into the low-MHz region—while keeping each output capped at 5 V, 5 mA so it remains safe for direct human-facing applications.
Because the project will handle live data, the entire chain has to support real-time streaming over Bluetooth Classic; latency has to stay low enough that an audio-rate round-trip remains perceptually seamless. Inside the enclosure, you can split the path however you wish—purely analog front ends feeding ADCs, DSP blocks, then DACs and analog output buffers—so long as the final architecture stays true to the mixed-signal brief.
What I expect from you
• Complete schematics with component choices that are currently purchasable
• A compact, manufacturable PCB layout (Altium, KiCad, or similar)
• Embedded firmware that handles Bluetooth pairing, eight-channel packet framing, error checking, and configurable sample rates
• A brief test routine or GUI so I can fire up all channels, sweep frequencies, and verify that the ±3 dB bandwidth spans audio to MHz
• Clear assembly, flashing, and calibration docs so a small lab team can reproduce your results
Acceptance will be based on:
1. Successful bench test at 48 kHz audio and 1 MHz RF points, measured at <10 ms end-to-end latency.
2. No channel exceeds 5 V / 5 mA under any operating mode.
3. Reliable Bluetooth Classic link sustained for 30 minutes with <0.1 % packet loss at 2 m distance in a typical office.
If any part of the workflow—such as antenna matching, DSP coefficient tuning, or enclosure EMI mitigation—needs particular attention, flag it early so we can iterate quickly. I’m ready to start as soon as I can see your proposed block diagram and parts list.
Ref: picture - imagine eliminating the wires.
Because the project will handle live data, the entire chain has to support real-time streaming over Bluetooth Classic; latency has to stay low enough that an audio-rate round-trip remains perceptually seamless. Inside the enclosure, you can split the path however you wish—purely analog front ends feeding ADCs, DSP blocks, then DACs and analog output buffers—so long as the final architecture stays true to the mixed-signal brief.
What I expect from you
• Complete schematics with component choices that are currently purchasable
• A compact, manufacturable PCB layout (Altium, KiCad, or similar)
• Embedded firmware that handles Bluetooth pairing, eight-channel packet framing, error checking, and configurable sample rates
• A brief test routine or GUI so I can fire up all channels, sweep frequencies, and verify that the ±3 dB bandwidth spans audio to MHz
• Clear assembly, flashing, and calibration docs so a small lab team can reproduce your results
Acceptance will be based on:
1. Successful bench test at 48 kHz audio and 1 MHz RF points, measured at <10 ms end-to-end latency.
2. No channel exceeds 5 V / 5 mA under any operating mode.
3. Reliable Bluetooth Classic link sustained for 30 minutes with <0.1 % packet loss at 2 m distance in a typical office.
If any part of the workflow—such as antenna matching, DSP coefficient tuning, or enclosure EMI mitigation—needs particular attention, flag it early so we can iterate quickly. I’m ready to start as soon as I can see your proposed block diagram and parts list.
Ref: picture - imagine eliminating the wires.