Is STM32F4 or nRF52840 better for voice recognition?

nRF52840 scores higher (70 vs 65) for voice recognition. The nRF52840's 256 KB SRAM at 64 MHz narrowly beats the alternative. However, ecosystem fit and connectivity needs should also influence your decision.

What's the price difference between STM32F4 and nRF52840?

STM32F4 chips cost $3-10, dev boards $10-30. nRF52840 runs $5-8 per chip, $20-35 for dev boards. Pricing is comparable at volume.

Can both STM32F4 and nRF52840 use TensorFlow Lite?

Yes, the STM32F4 (cortex-m4f) supports TFLite Micro. The nRF52840 (cortex-m4f) also supports TFLite Micro.

Hardware Comparison

STM32F4 vs nRF52840 for Voice Recognition

Winner: nRF52840 (score 70 vs 65)

Specs Comparison

Spec	STM32F4	nRF52840
Manufacturer	STMicroelectronics	Nordic Semiconductor
Architecture	ARM Cortex-M4F @ 168 MHz	ARM Cortex-M4F @ 64 MHz
SRAM	192 KB	256 KB
Flash	1 MB	1 MB
ML Acceleration	DSP, FPU	DSP, FPU
Connectivity	USB OTG FS	Bluetooth 5.0 LE, 802.15.4 (Thread/Zigbee), NFC, USB 2.0
Chip Price	$3-10	$5-8
Voice Recognition Score	65 (Good)	70 (Good)

Detailed Comparison

Both the STM32F4 and nRF52840 are strong choices for voice recognition. The difference in compatibility scores (65 vs 70) is marginal, so the decision comes down to ecosystem preference, connectivity requirements, and budget. Memory: The STM32F4 provides 192 KB SRAM, while the nRF52840 offers 256 KB. For voice recognition's 128 KB minimum requirement, the nRF52840 offers more margin. Performance: The STM32F4 runs at 168 MHz (cortex-m4f, DSP) vs the nRF52840 at 64 MHz (cortex-m4f, DSP). The STM32F4's significantly higher clock speed translates to faster inference. Connectivity: STM32F4 offers USB OTG FS. nRF52840 provides Bluetooth 5.0 LE, 802.15.4 (Thread/Zigbee), NFC, USB 2.0. Cost: STM32F4 chips run $3-10 (dev boards $10-30), while nRF52840 chips cost $5-8 (dev boards $20-35). The STM32F4 is more cost-effective for volume deployments. Choose the STM32F4 when: cost optimization is critical, the STMicroelectronics ecosystem fits your toolchain, or hardware variety is important (105 PlatformIO boards). Choose the nRF52840 when: you need maximum RAM headroom, Zephyr RTOS and BLE are priorities, or you need built-in 9-axis imu (lsm9ds1) on arduino nano 33 ble.

Explore Each Platform

STM32F4 Hardware Guides

STMicroelectronics cortex-m4f — 192 KB SRAM, 168 MHz

nRF52840 Hardware Guides

Nordic Semiconductor cortex-m4f — 256 KB SRAM, 64 MHz

FAQ

Is STM32F4 or nRF52840 better for voice recognition?: nRF52840 scores higher (70 vs 65) for voice recognition. The nRF52840's 256 KB SRAM at 64 MHz narrowly beats the alternative. However, ecosystem fit and connectivity needs should also influence your decision.
What's the price difference between STM32F4 and nRF52840?: STM32F4 chips cost $3-10, dev boards $10-30. nRF52840 runs $5-8 per chip, $20-35 for dev boards. Pricing is comparable at volume.
Can both STM32F4 and nRF52840 use TensorFlow Lite?: Yes, the STM32F4 (cortex-m4f) supports TFLite Micro. The nRF52840 (cortex-m4f) also supports TFLite Micro.

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