Is STM32H7 or nRF52840 better for object detection?

STM32H7 scores higher (90 vs 20) for object detection. The STM32H7's 1024 KB SRAM and 480 MHz clock provide a significant edge. However, ecosystem fit and connectivity needs should also influence your decision.

What's the price difference between STM32H7 and nRF52840?

STM32H7 chips cost $8-20, dev boards $30-80. nRF52840 runs $5-8 per chip, $20-35 for dev boards. At volume, the nRF52840 offers better cost efficiency.

Can both STM32H7 and nRF52840 use TensorFlow Lite?

Yes, the STM32H7 (cortex-m7) supports TFLite Micro. The nRF52840 (cortex-m4f) also supports TFLite Micro.

Hardware Comparison

STM32H7 vs nRF52840 for Object Detection

Winner: STM32H7 (score 90 vs 20)

Specs Comparison

Spec	STM32H7	nRF52840
Manufacturer	STMicroelectronics	Nordic Semiconductor
Architecture	ARM Cortex-M7 @ 480 MHz	ARM Cortex-M4F @ 64 MHz
SRAM	1024 KB	256 KB
Flash	2 MB	1 MB
ML Acceleration	DSP, FPU	DSP, FPU
Connectivity	Ethernet, USB OTG HS/FS	Bluetooth 5.0 LE, 802.15.4 (Thread/Zigbee), NFC, USB 2.0
Chip Price	$8-20	$5-8
Object Detection Score	90 (Excellent)	20 (Not Recommended)

Detailed Comparison

The STM32H7 edges ahead for object detection with a compatibility score of 90 vs 20 for the nRF52840. However, each platform has distinct advantages depending on deployment requirements. Memory: The STM32H7 provides 1024 KB SRAM, while the nRF52840 offers 256 KB. For object detection's 256 KB minimum requirement, the STM32H7 provides more headroom. Performance: The STM32H7 runs at 480 MHz (cortex-m7, DSP) vs the nRF52840 at 64 MHz (cortex-m4f, DSP). The STM32H7's significantly higher clock speed translates to faster inference. Connectivity: STM32H7 offers Ethernet, USB OTG HS/FS. nRF52840 provides Bluetooth 5.0 LE, 802.15.4 (Thread/Zigbee), NFC, USB 2.0. Cost: STM32H7 chips run $8-20 (dev boards $30-80), while nRF52840 chips cost $5-8 (dev boards $20-35). The nRF52840 wins on cost per unit. Choose the STM32H7 when: you need more RAM for larger models, the STMicroelectronics ecosystem fits your toolchain, or your team already uses this platform. Choose the nRF52840 when: Zephyr RTOS and BLE are priorities, or you need built-in 9-axis imu (lsm9ds1) on arduino nano 33 ble.

Explore Each Platform

STM32H7 Hardware Guides

STMicroelectronics cortex-m7 — 1024 KB SRAM, 480 MHz

nRF52840 Hardware Guides

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

FAQ

Is STM32H7 or nRF52840 better for object detection?: STM32H7 scores higher (90 vs 20) for object detection. The STM32H7's 1024 KB SRAM and 480 MHz clock provide a significant edge. However, ecosystem fit and connectivity needs should also influence your decision.
What's the price difference between STM32H7 and nRF52840?: STM32H7 chips cost $8-20, dev boards $30-80. nRF52840 runs $5-8 per chip, $20-35 for dev boards. At volume, the nRF52840 offers better cost efficiency.
Can both STM32H7 and nRF52840 use TensorFlow Lite?: Yes, the STM32H7 (cortex-m7) supports TFLite Micro. The nRF52840 (cortex-m4f) also supports TFLite Micro.

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